# CVE-2026-14899: Off-by-one out of bounds read in MIME header parser for forwarding

CVE-2026-14899 is fixed in 134 products on 2 platforms, first by Mozilla Thunderbird (af) 141.0, released July 22, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-14899
- Priority: High
- CVSS: 8.8 (moderate)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 22, 2026
- Weakness: CWE-193: Off-by-one Error
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-14899

## Description

The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Thunderbird (af) | 141.0 | [Mozilla Thunderbird (af) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.af-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ar) | 141.0 | [Mozilla Thunderbird (ar) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ar-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ast) | 141.0 | [Mozilla Thunderbird (ast) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ast-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (be) | 141.0 | [Mozilla Thunderbird (be) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.be-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (bg) | 141.0 | [Mozilla Thunderbird (bg) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.bg-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (br) | 141.0 | [Mozilla Thunderbird (br) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.br-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ca) | 141.0 | [Mozilla Thunderbird (ca) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ca-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (cak) | 141.0 | [Mozilla Thunderbird (cak) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cak-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (cs) | 141.0 | [Mozilla Thunderbird (cs) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cs-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (cy) | 141.0 | [Mozilla Thunderbird (cy) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cy-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (da) | 141.0 | [Mozilla Thunderbird (da) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.da-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (de) | 141.0 | [Mozilla Thunderbird (de) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.de-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (dsb) | 141.0 | [Mozilla Thunderbird (dsb) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.dsb-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (el) | 141.0 | [Mozilla Thunderbird (el) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.el-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (en-CA) | 141.0 | [Mozilla Thunderbird (en-CA) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-ca-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (en-GB) | 141.0 | [Mozilla Thunderbird (en-GB) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-gb-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (en-US) | 141.0 | [Mozilla Thunderbird (en-US) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (es-AR) | 141.0 | [Mozilla Thunderbird (es-AR) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-ar-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (es-ES) | 141.0 | [Mozilla Thunderbird (es-ES) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-es-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (es-MX) | 141.0 | [Mozilla Thunderbird (es-MX) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-mx-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (et) | 141.0 | [Mozilla Thunderbird (et) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.et-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (eu) | 141.0 | [Mozilla Thunderbird (eu) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.eu-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (fi) | 141.0 | [Mozilla Thunderbird (fi) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fi-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (fr) | 141.0 | [Mozilla Thunderbird (fr) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fr-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (fy-NL) | 141.0 | [Mozilla Thunderbird (fy-NL) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fy-nl-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ga-IE) | 141.0 | [Mozilla Thunderbird (ga-IE) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ga-ie-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (gd) | 141.0 | [Mozilla Thunderbird (gd) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gd-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (gl) | 141.0 | [Mozilla Thunderbird (gl) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gl-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (he) | 141.0 | [Mozilla Thunderbird (he) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.he-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (hr) | 141.0 | [Mozilla Thunderbird (hr) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hr-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (hsb) | 141.0 | [Mozilla Thunderbird (hsb) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hsb-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (hu) | 141.0 | [Mozilla Thunderbird (hu) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hu-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (hy-AM) | 141.0 | [Mozilla Thunderbird (hy-AM) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hy-am-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (id) | 141.0 | [Mozilla Thunderbird (id) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.id-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (is) | 141.0 | [Mozilla Thunderbird (is) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.is-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (it) | 141.0 | [Mozilla Thunderbird (it) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.it-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ja) | 141.0 | [Mozilla Thunderbird (ja) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ja-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ka) | 141.0 | [Mozilla Thunderbird (ka) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ka-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (kab) | 141.0 | [Mozilla Thunderbird (kab) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kab-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (kk) | 141.0 | [Mozilla Thunderbird (kk) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kk-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ko) | 141.0 | [Mozilla Thunderbird (ko) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ko-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (lt) | 141.0 | [Mozilla Thunderbird (lt) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lt-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (lv) | 141.0 | [Mozilla Thunderbird (lv) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lv-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ms) | 141.0 | [Mozilla Thunderbird (ms) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ms-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (nb-NO) | 141.0 | [Mozilla Thunderbird (nb-NO) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nb-no-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (nl) | 141.0 | [Mozilla Thunderbird (nl) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nl-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (nn-NO) | 141.0 | [Mozilla Thunderbird (nn-NO) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nn-no-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (pa-IN) | 141.0 | [Mozilla Thunderbird (pa-IN) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pa-in-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (pl) | 141.0 | [Mozilla Thunderbird (pl) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pl-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (pt-BR) | 141.0 | [Mozilla Thunderbird (pt-BR) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-br-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (pt-PT) | 141.0 | [Mozilla Thunderbird (pt-PT) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-pt-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (rm) | 141.0 | [Mozilla Thunderbird (rm) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.rm-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ro) | 141.0 | [Mozilla Thunderbird (ro) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ro-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (ru) | 141.0 | [Mozilla Thunderbird (ru) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ru-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (sk) | 141.0 | [Mozilla Thunderbird (sk) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sk-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (sl) | 141.0 | [Mozilla Thunderbird (sl) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sl-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (sq) | 141.0 | [Mozilla Thunderbird (sq) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sq-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (sr) | 141.0 | [Mozilla Thunderbird (sr) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sr-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (sv-SE) | 141.0 | [Mozilla Thunderbird (sv-SE) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sv-se-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (th) | 141.0 | [Mozilla Thunderbird (th) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.th-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (tr) | 141.0 | [Mozilla Thunderbird (tr) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.tr-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (uk) | 141.0 | [Mozilla Thunderbird (uk) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uk-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (uz) | 141.0 | [Mozilla Thunderbird (uz) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uz-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (vi) | 141.0 | [Mozilla Thunderbird (vi) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.vi-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (zh-CN) | 141.0 | [Mozilla Thunderbird (zh-CN) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-cn-141.0.md) | Jul 22, 2025 |
| Windows apps | Mozilla Thunderbird (zh-TW) | 141.0 | [Mozilla Thunderbird (zh-TW) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-tw-141.0.md) | Jul 22, 2025 |
| 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) | 140.15.0 | [Mozilla Thunderbird ESR (en-US) 140.15.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr-140.15.0.md) | Sep 1, 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 sles 15.7 | 153.2.0-150400.13.3.1 | [SUSE-SU-2026:4268-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4268-1.md) | Sep 18, 2026 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:140.13.0esr-2~deb12u1 | [DEBIAN-CVE-2026-14899](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14899.md) | Aug 8, 2026 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:140.13.0esr-2~deb13u1 | [DEBIAN-CVE-2026-14899](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14899.md) | Aug 8, 2026 |
| Linux | thunderbird Debian 14 | 1:140.13.0esr-1 | [DEBIAN-CVE-2026-14899](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14899.md) | Aug 8, 2026 |
| Linux | thunderbird RHEL 10 | 140.13.0-1.el10_0 | [RHSA-2026:53445](https://patchblox.com/security/data/fix/linux/rhsa-2026-53445.md) | Aug 3, 2026 |
| Linux | thunderbird RHEL 8 | 0:140.13.0-1.el8_10 | [RHSA-2026:49922](https://patchblox.com/security/data/fix/linux/rhsa-2026-49922.md) | Aug 5, 2026 |
| Linux | thunderbird RHEL 9 | 0:140.13.0-1.el9_8 | [RHSA-2026:49921](https://patchblox.com/security/data/fix/linux/rhsa-2026-49921.md) | Aug 5, 2026 |
| Linux | thunderbird almalinux 10 | 140.13.0-1.el10_2.alma.1 | [ALSA-2026:49621](https://patchblox.com/security/data/fix/linux/alsa-2026-49621.md) | Aug 3, 2026 |
| Linux | thunderbird almalinux 8 | 140.13.0-1.el8_10.alma.1 | [ALSA-2026:49922](https://patchblox.com/security/data/fix/linux/alsa-2026-49922.md) | Aug 4, 2026 |
| Linux | thunderbird almalinux 9 | 140.13.0-1.el9_8.alma.1 | [ALSA-2026:49921](https://patchblox.com/security/data/fix/linux/alsa-2026-49921.md) | Aug 4, 2026 |
| Linux | thunderbird ol 10 | 0:140.13.0-1.0.1.el10_2 | [ELSA-2026-49621](https://patchblox.com/security/data/fix/linux/elsa-2026-49621.md) | Aug 3, 2026 |
| Linux | thunderbird ol 8 | 0:140.13.0-1.0.1.el8_10 | [ELSA-2026-49922](https://patchblox.com/security/data/fix/linux/elsa-2026-49922.md) | Aug 4, 2026 |
| Linux | thunderbird ol 9 | 0:140.13.0-1.0.1.el9_8 | [ELSA-2026-49921](https://patchblox.com/security/data/fix/linux/elsa-2026-49921.md) | Aug 4, 2026 |
| Linux | thunderbird rocky 10 | 0:140.13.0-1.el10_2 | [RLSA-2026:49621](https://patchblox.com/security/data/fix/linux/rlsa-2026-49621.md) | Aug 6, 2026 |
| Linux | thunderbird rocky 8 | 0:140.13.0-1.el8_10 | [RLSA-2026:49922](https://patchblox.com/security/data/fix/linux/rlsa-2026-49922.md) | Aug 6, 2026 |
| Linux | thunderbird rocky 9 | 0:140.13.0-1.el9_8 | [RLSA-2026:49921](https://patchblox.com/security/data/fix/linux/rlsa-2026-49921.md) | Aug 6, 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

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