# CVE-2026-4371: Out of bounds read in IMAP parsing

CVE-2026-4371 is fixed in 134 products on 2 platforms, first by Mozilla Thunderbird (af) 149.0, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-4371
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 24, 2026
- Weakness: CWE-126: Buffer Over-read
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-4371

## Description

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Thunderbird (af) | 149.0 | [Mozilla Thunderbird (af) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.af-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ar) | 149.0 | [Mozilla Thunderbird (ar) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ar-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ast) | 149.0 | [Mozilla Thunderbird (ast) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ast-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (be) | 149.0 | [Mozilla Thunderbird (be) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.be-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (bg) | 149.0 | [Mozilla Thunderbird (bg) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.bg-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (br) | 149.0 | [Mozilla Thunderbird (br) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.br-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ca) | 149.0 | [Mozilla Thunderbird (ca) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ca-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (cak) | 149.0 | [Mozilla Thunderbird (cak) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cak-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (cs) | 149.0 | [Mozilla Thunderbird (cs) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cs-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (cy) | 149.0 | [Mozilla Thunderbird (cy) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cy-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (da) | 149.0 | [Mozilla Thunderbird (da) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.da-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (de) | 149.0 | [Mozilla Thunderbird (de) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.de-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (dsb) | 149.0 | [Mozilla Thunderbird (dsb) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.dsb-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (el) | 149.0 | [Mozilla Thunderbird (el) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.el-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (en-CA) | 149.0 | [Mozilla Thunderbird (en-CA) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-ca-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (en-GB) | 149.0 | [Mozilla Thunderbird (en-GB) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-gb-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (en-US) | 149.0 | [Mozilla Thunderbird (en-US) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (es-AR) | 149.0 | [Mozilla Thunderbird (es-AR) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-ar-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (es-ES) | 149.0 | [Mozilla Thunderbird (es-ES) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-es-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (es-MX) | 149.0 | [Mozilla Thunderbird (es-MX) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-mx-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (et) | 149.0 | [Mozilla Thunderbird (et) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.et-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (eu) | 149.0 | [Mozilla Thunderbird (eu) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.eu-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (fi) | 149.0 | [Mozilla Thunderbird (fi) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fi-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (fr) | 149.0 | [Mozilla Thunderbird (fr) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fr-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (fy-NL) | 149.0 | [Mozilla Thunderbird (fy-NL) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fy-nl-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ga-IE) | 149.0 | [Mozilla Thunderbird (ga-IE) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ga-ie-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (gd) | 149.0 | [Mozilla Thunderbird (gd) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gd-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (gl) | 149.0 | [Mozilla Thunderbird (gl) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gl-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (he) | 149.0 | [Mozilla Thunderbird (he) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.he-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (hr) | 149.0 | [Mozilla Thunderbird (hr) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hr-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (hsb) | 149.0 | [Mozilla Thunderbird (hsb) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hsb-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (hu) | 149.0 | [Mozilla Thunderbird (hu) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hu-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (hy-AM) | 149.0 | [Mozilla Thunderbird (hy-AM) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hy-am-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (id) | 149.0 | [Mozilla Thunderbird (id) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.id-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (is) | 149.0 | [Mozilla Thunderbird (is) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.is-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (it) | 149.0 | [Mozilla Thunderbird (it) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.it-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ja) | 149.0 | [Mozilla Thunderbird (ja) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ja-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ka) | 149.0 | [Mozilla Thunderbird (ka) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ka-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (kab) | 149.0 | [Mozilla Thunderbird (kab) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kab-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (kk) | 149.0 | [Mozilla Thunderbird (kk) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kk-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ko) | 149.0 | [Mozilla Thunderbird (ko) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ko-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (lt) | 149.0 | [Mozilla Thunderbird (lt) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lt-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (lv) | 149.0 | [Mozilla Thunderbird (lv) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lv-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ms) | 149.0 | [Mozilla Thunderbird (ms) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ms-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (nb-NO) | 149.0 | [Mozilla Thunderbird (nb-NO) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nb-no-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (nl) | 149.0 | [Mozilla Thunderbird (nl) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nl-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (nn-NO) | 149.0 | [Mozilla Thunderbird (nn-NO) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nn-no-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (pa-IN) | 149.0 | [Mozilla Thunderbird (pa-IN) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pa-in-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (pl) | 149.0 | [Mozilla Thunderbird (pl) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pl-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (pt-BR) | 149.0 | [Mozilla Thunderbird (pt-BR) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-br-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (pt-PT) | 149.0 | [Mozilla Thunderbird (pt-PT) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-pt-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (rm) | 149.0 | [Mozilla Thunderbird (rm) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.rm-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ro) | 149.0 | [Mozilla Thunderbird (ro) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ro-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (ru) | 149.0 | [Mozilla Thunderbird (ru) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ru-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (sk) | 149.0 | [Mozilla Thunderbird (sk) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sk-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (sl) | 149.0 | [Mozilla Thunderbird (sl) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sl-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (sq) | 149.0 | [Mozilla Thunderbird (sq) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sq-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (sr) | 149.0 | [Mozilla Thunderbird (sr) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sr-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (sv-SE) | 149.0 | [Mozilla Thunderbird (sv-SE) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sv-se-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (th) | 149.0 | [Mozilla Thunderbird (th) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.th-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (tr) | 149.0 | [Mozilla Thunderbird (tr) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.tr-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (uk) | 149.0 | [Mozilla Thunderbird (uk) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uk-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (uz) | 149.0 | [Mozilla Thunderbird (uz) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uz-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (vi) | 149.0 | [Mozilla Thunderbird (vi) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.vi-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (zh-CN) | 149.0 | [Mozilla Thunderbird (zh-CN) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-cn-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird (zh-TW) | 149.0 | [Mozilla Thunderbird (zh-TW) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-tw-149.0.md) | Mar 24, 2026 |
| Windows apps | Mozilla Thunderbird ESR (af) | 153.0.1 | [Mozilla Thunderbird ESR (af) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.af-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ar) | 153.0.1 | [Mozilla Thunderbird ESR (ar) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ar-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ast) | 153.0.1 | [Mozilla Thunderbird ESR (ast) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ast-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (be) | 153.0.1 | [Mozilla Thunderbird ESR (be) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.be-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (bg) | 153.0.1 | [Mozilla Thunderbird ESR (bg) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.bg-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (br) | 153.0.1 | [Mozilla Thunderbird ESR (br) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.br-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ca) | 153.0.1 | [Mozilla Thunderbird ESR (ca) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ca-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cak) | 153.0.1 | [Mozilla Thunderbird ESR (cak) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cak-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cs) | 153.0.1 | [Mozilla Thunderbird ESR (cs) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cs-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cy) | 153.0.1 | [Mozilla Thunderbird ESR (cy) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cy-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (da) | 153.0.1 | [Mozilla Thunderbird ESR (da) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.da-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (de) | 153.0.1 | [Mozilla Thunderbird ESR (de) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.de-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (dsb) | 153.0.1 | [Mozilla Thunderbird ESR (dsb) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.dsb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (el) | 153.0.1 | [Mozilla Thunderbird ESR (el) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.el-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-CA) | 153.0.1 | [Mozilla Thunderbird ESR (en-CA) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-ca-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-GB) | 153.0.1 | [Mozilla Thunderbird ESR (en-GB) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-gb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-US) | 153.0.1 | [Mozilla Thunderbird ESR (en-US) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-AR) | 153.0.1 | [Mozilla Thunderbird ESR (es-AR) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-ar-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-ES) | 153.0.1 | [Mozilla Thunderbird ESR (es-ES) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-es-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-MX) | 153.0.1 | [Mozilla Thunderbird ESR (es-MX) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-mx-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (et) | 153.0.1 | [Mozilla Thunderbird ESR (et) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.et-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (eu) | 153.0.1 | [Mozilla Thunderbird ESR (eu) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.eu-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fi) | 153.0.1 | [Mozilla Thunderbird ESR (fi) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fi-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fr) | 153.0.1 | [Mozilla Thunderbird ESR (fr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fy-NL) | 153.0.1 | [Mozilla Thunderbird ESR (fy-NL) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fy-nl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ga-IE) | 153.0.1 | [Mozilla Thunderbird ESR (ga-IE) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ga-ie-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gd) | 153.0.1 | [Mozilla Thunderbird ESR (gd) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gd-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gl) | 153.0.1 | [Mozilla Thunderbird ESR (gl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (he) | 153.0.1 | [Mozilla Thunderbird ESR (he) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.he-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hr) | 153.0.1 | [Mozilla Thunderbird ESR (hr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hsb) | 153.0.1 | [Mozilla Thunderbird ESR (hsb) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hsb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hu) | 153.0.1 | [Mozilla Thunderbird ESR (hu) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hu-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hy-AM) | 153.0.1 | [Mozilla Thunderbird ESR (hy-AM) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hy-am-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (id) | 153.0.1 | [Mozilla Thunderbird ESR (id) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.id-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (is) | 153.0.1 | [Mozilla Thunderbird ESR (is) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.is-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (it) | 153.0.1 | [Mozilla Thunderbird ESR (it) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.it-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ja) | 153.0.1 | [Mozilla Thunderbird ESR (ja) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ja-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ka) | 153.0.1 | [Mozilla Thunderbird ESR (ka) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ka-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kab) | 153.0.1 | [Mozilla Thunderbird ESR (kab) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kab-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kk) | 153.0.1 | [Mozilla Thunderbird ESR (kk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ko) | 153.0.1 | [Mozilla Thunderbird ESR (ko) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ko-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lt) | 153.0.1 | [Mozilla Thunderbird ESR (lt) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lt-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lv) | 153.0.1 | [Mozilla Thunderbird ESR (lv) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lv-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ms) | 153.0.1 | [Mozilla Thunderbird ESR (ms) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ms-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nb-NO) | 153.0.1 | [Mozilla Thunderbird ESR (nb-NO) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nb-no-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nl) | 153.0.1 | [Mozilla Thunderbird ESR (nl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nn-NO) | 153.0.1 | [Mozilla Thunderbird ESR (nn-NO) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nn-no-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pa-IN) | 153.0.1 | [Mozilla Thunderbird ESR (pa-IN) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pa-in-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pl) | 153.0.1 | [Mozilla Thunderbird ESR (pl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-BR) | 153.0.1 | [Mozilla Thunderbird ESR (pt-BR) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-br-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-PT) | 153.0.1 | [Mozilla Thunderbird ESR (pt-PT) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-pt-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (rm) | 153.0.1 | [Mozilla Thunderbird ESR (rm) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.rm-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ro) | 153.0.1 | [Mozilla Thunderbird ESR (ro) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ro-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ru) | 153.0.1 | [Mozilla Thunderbird ESR (ru) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ru-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sk) | 153.0.1 | [Mozilla Thunderbird ESR (sk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sl) | 153.0.1 | [Mozilla Thunderbird ESR (sl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sq) | 153.0.1 | [Mozilla Thunderbird ESR (sq) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sq-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sr) | 153.0.1 | [Mozilla Thunderbird ESR (sr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sv-SE) | 153.0.1 | [Mozilla Thunderbird ESR (sv-SE) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sv-se-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (th) | 153.0.1 | [Mozilla Thunderbird ESR (th) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.th-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (tr) | 153.0.1 | [Mozilla Thunderbird ESR (tr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.tr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uk) | 153.0.1 | [Mozilla Thunderbird ESR (uk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uz) | 153.0.1 | [Mozilla Thunderbird ESR (uz) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uz-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (vi) | 153.0.1 | [Mozilla Thunderbird ESR (vi) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.vi-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-CN) | 153.0.1 | [Mozilla Thunderbird ESR (zh-CN) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-cn-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-TW) | 153.0.1 | [Mozilla Thunderbird ESR (zh-TW) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-tw-153.0.1.md) | Jul 23, 2026 |
| Linux | MozillaThunderbird opensuse-leap 15.6 | 140.9.0-150200.8.263.1 | [SUSE-SU-2026:1163-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1163-1.md) | Apr 1, 2026 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:140.9.0esr-1~deb12u1 | [DEBIAN-CVE-2026-4371](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4371.md) | Mar 24, 2026 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:140.9.0esr-1~deb13u1 | [DEBIAN-CVE-2026-4371](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4371.md) | Mar 24, 2026 |
| Linux | thunderbird Debian 14 | 1:140.9.0esr-1 | [DEBIAN-CVE-2026-4371](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4371.md) | Mar 24, 2026 |
| Linux | thunderbird RHEL 10 | 140.9.0-1.el10_0 | [RHSA-2026:8315](https://patchblox.com/security/data/fix/linux/rhsa-2026-8315.md) | Apr 15, 2026 |
| Linux | thunderbird RHEL 8 | 0:140.9.0-1.el8_10 | [RHSA-2026:6917](https://patchblox.com/security/data/fix/linux/rhsa-2026-6917.md) | Apr 15, 2026 |
| Linux | thunderbird RHEL 9 | 0:140.9.0-1.el9_7 | [RHSA-2026:6188](https://patchblox.com/security/data/fix/linux/rhsa-2026-6188.md) | Apr 15, 2026 |
| Linux | thunderbird almalinux 10 | 140.9.0-1.el10_1.alma.1 | [ALSA-2026:6342](https://patchblox.com/security/data/fix/linux/alsa-2026-6342.md) | Apr 1, 2026 |
| Linux | thunderbird almalinux 8 | 140.9.0-1.el8_10.alma.1 | [ALSA-2026:6917](https://patchblox.com/security/data/fix/linux/alsa-2026-6917.md) | Apr 7, 2026 |
| Linux | thunderbird almalinux 9 | 140.9.0-1.el9_7.alma.1 | [ALSA-2026:6188](https://patchblox.com/security/data/fix/linux/alsa-2026-6188.md) | Mar 30, 2026 |
| Linux | thunderbird ol 10 | 0:140.9.0-1.0.1.el10_1 | [ELSA-2026-6342](https://patchblox.com/security/data/fix/linux/elsa-2026-6342.md) | Apr 1, 2026 |
| Linux | thunderbird ol 8 | 0:140.9.0-1.0.1.el8_10 | [ELSA-2026-6917](https://patchblox.com/security/data/fix/linux/elsa-2026-6917.md) | Apr 7, 2026 |
| Linux | thunderbird ol 9 | 0:140.9.0-1.0.1.el9_7 | [ELSA-2026-6188](https://patchblox.com/security/data/fix/linux/elsa-2026-6188.md) | Mar 30, 2026 |
| Linux | thunderbird rocky 10 | 0:140.9.0-1.el10_1 | [RLSA-2026:6342](https://patchblox.com/security/data/fix/linux/rlsa-2026-6342.md) | Apr 9, 2026 |
| Linux | thunderbird rocky 8 | 0:140.9.0-1.el8_10 | [RLSA-2026:6917](https://patchblox.com/security/data/fix/linux/rlsa-2026-6917.md) | Apr 12, 2026 |
| Linux | thunderbird rocky 9 | 0:140.9.0-1.el9_7 | [RLSA-2026:6188](https://patchblox.com/security/data/fix/linux/rlsa-2026-6188.md) | Apr 7, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.