# CVE-2026-103500: Heap buffer overflow opening large email

CVE-2026-103500 is fixed in 135 products on 3 platforms, first by Mozilla Thunderbird 157.0, released September 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-103500
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 30, 2026
- Weakness: CWE-122: Heap-based Buffer Overflow
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-103500

## Description

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Thunderbird (af) | 157.0 | [Mozilla Thunderbird (af) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.af-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ar) | 157.0 | [Mozilla Thunderbird (ar) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ar-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ast) | 157.0 | [Mozilla Thunderbird (ast) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ast-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (be) | 157.0 | [Mozilla Thunderbird (be) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.be-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (bg) | 157.0 | [Mozilla Thunderbird (bg) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.bg-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (br) | 157.0 | [Mozilla Thunderbird (br) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.br-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ca) | 157.0 | [Mozilla Thunderbird (ca) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ca-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (cak) | 157.0 | [Mozilla Thunderbird (cak) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cak-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (cs) | 157.0 | [Mozilla Thunderbird (cs) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cs-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (cy) | 157.0 | [Mozilla Thunderbird (cy) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cy-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (da) | 157.0 | [Mozilla Thunderbird (da) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.da-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (de) | 157.0 | [Mozilla Thunderbird (de) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.de-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (dsb) | 157.0 | [Mozilla Thunderbird (dsb) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.dsb-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (el) | 157.0 | [Mozilla Thunderbird (el) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.el-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (en-CA) | 157.0 | [Mozilla Thunderbird (en-CA) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-ca-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (en-GB) | 157.0 | [Mozilla Thunderbird (en-GB) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-gb-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (en-US) | 157.0 | [Mozilla Thunderbird (en-US) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (es-AR) | 157.0 | [Mozilla Thunderbird (es-AR) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-ar-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (es-ES) | 157.0 | [Mozilla Thunderbird (es-ES) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-es-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (es-MX) | 157.0 | [Mozilla Thunderbird (es-MX) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-mx-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (et) | 157.0 | [Mozilla Thunderbird (et) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.et-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (eu) | 157.0 | [Mozilla Thunderbird (eu) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.eu-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (fi) | 157.0 | [Mozilla Thunderbird (fi) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fi-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (fr) | 157.0 | [Mozilla Thunderbird (fr) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fr-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (fy-NL) | 157.0 | [Mozilla Thunderbird (fy-NL) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fy-nl-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ga-IE) | 157.0 | [Mozilla Thunderbird (ga-IE) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ga-ie-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (gd) | 157.0 | [Mozilla Thunderbird (gd) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gd-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (gl) | 157.0 | [Mozilla Thunderbird (gl) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gl-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (he) | 157.0 | [Mozilla Thunderbird (he) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.he-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (hr) | 157.0 | [Mozilla Thunderbird (hr) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hr-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (hsb) | 157.0 | [Mozilla Thunderbird (hsb) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hsb-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (hu) | 157.0 | [Mozilla Thunderbird (hu) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hu-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (hy-AM) | 157.0 | [Mozilla Thunderbird (hy-AM) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hy-am-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (id) | 157.0 | [Mozilla Thunderbird (id) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.id-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (is) | 157.0 | [Mozilla Thunderbird (is) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.is-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (it) | 157.0 | [Mozilla Thunderbird (it) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.it-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ja) | 157.0 | [Mozilla Thunderbird (ja) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ja-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ka) | 157.0 | [Mozilla Thunderbird (ka) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ka-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (kab) | 157.0 | [Mozilla Thunderbird (kab) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kab-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (kk) | 157.0 | [Mozilla Thunderbird (kk) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kk-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ko) | 157.0 | [Mozilla Thunderbird (ko) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ko-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (lt) | 157.0 | [Mozilla Thunderbird (lt) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lt-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (lv) | 157.0 | [Mozilla Thunderbird (lv) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lv-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ms) | 157.0 | [Mozilla Thunderbird (ms) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ms-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (nb-NO) | 157.0 | [Mozilla Thunderbird (nb-NO) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nb-no-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (nl) | 157.0 | [Mozilla Thunderbird (nl) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nl-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (nn-NO) | 157.0 | [Mozilla Thunderbird (nn-NO) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nn-no-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (pa-IN) | 157.0 | [Mozilla Thunderbird (pa-IN) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pa-in-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (pl) | 157.0 | [Mozilla Thunderbird (pl) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pl-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (pt-BR) | 157.0 | [Mozilla Thunderbird (pt-BR) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-br-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (pt-PT) | 157.0 | [Mozilla Thunderbird (pt-PT) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-pt-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (rm) | 157.0 | [Mozilla Thunderbird (rm) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.rm-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ro) | 157.0 | [Mozilla Thunderbird (ro) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ro-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (ru) | 157.0 | [Mozilla Thunderbird (ru) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ru-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (sk) | 157.0 | [Mozilla Thunderbird (sk) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sk-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (sl) | 157.0 | [Mozilla Thunderbird (sl) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sl-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (sq) | 157.0 | [Mozilla Thunderbird (sq) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sq-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (sr) | 157.0 | [Mozilla Thunderbird (sr) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sr-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (sv-SE) | 157.0 | [Mozilla Thunderbird (sv-SE) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sv-se-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (th) | 157.0 | [Mozilla Thunderbird (th) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.th-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (tr) | 157.0 | [Mozilla Thunderbird (tr) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.tr-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (uk) | 157.0 | [Mozilla Thunderbird (uk) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uk-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (uz) | 157.0 | [Mozilla Thunderbird (uz) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uz-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (vi) | 157.0 | [Mozilla Thunderbird (vi) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.vi-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (zh-CN) | 157.0 | [Mozilla Thunderbird (zh-CN) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-cn-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird (zh-TW) | 157.0 | [Mozilla Thunderbird (zh-TW) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-tw-157.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (af) | 153.4.0 | [Mozilla Thunderbird ESR (af) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.af-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ar) | 153.4.0 | [Mozilla Thunderbird ESR (ar) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ar-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ast) | 153.4.0 | [Mozilla Thunderbird ESR (ast) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ast-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (be) | 153.4.0 | [Mozilla Thunderbird ESR (be) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.be-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (bg) | 153.4.0 | [Mozilla Thunderbird ESR (bg) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.bg-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (br) | 153.4.0 | [Mozilla Thunderbird ESR (br) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.br-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ca) | 153.4.0 | [Mozilla Thunderbird ESR (ca) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ca-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cak) | 153.4.0 | [Mozilla Thunderbird ESR (cak) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cak-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cs) | 153.4.0 | [Mozilla Thunderbird ESR (cs) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cs-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cy) | 153.4.0 | [Mozilla Thunderbird ESR (cy) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cy-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (da) | 153.4.0 | [Mozilla Thunderbird ESR (da) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.da-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (de) | 153.4.0 | [Mozilla Thunderbird ESR (de) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.de-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (dsb) | 153.4.0 | [Mozilla Thunderbird ESR (dsb) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.dsb-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (el) | 153.4.0 | [Mozilla Thunderbird ESR (el) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.el-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-CA) | 153.4.0 | [Mozilla Thunderbird ESR (en-CA) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-ca-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-GB) | 153.4.0 | [Mozilla Thunderbird ESR (en-GB) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-gb-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-US) | 153.4.0 | [Mozilla Thunderbird ESR (en-US) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-AR) | 153.4.0 | [Mozilla Thunderbird ESR (es-AR) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-ar-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-ES) | 153.4.0 | [Mozilla Thunderbird ESR (es-ES) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-es-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-MX) | 153.4.0 | [Mozilla Thunderbird ESR (es-MX) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-mx-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (et) | 153.4.0 | [Mozilla Thunderbird ESR (et) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.et-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (eu) | 153.4.0 | [Mozilla Thunderbird ESR (eu) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.eu-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fi) | 153.4.0 | [Mozilla Thunderbird ESR (fi) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fi-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fr) | 153.4.0 | [Mozilla Thunderbird ESR (fr) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fr-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fy-NL) | 153.4.0 | [Mozilla Thunderbird ESR (fy-NL) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fy-nl-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ga-IE) | 153.4.0 | [Mozilla Thunderbird ESR (ga-IE) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ga-ie-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gd) | 153.4.0 | [Mozilla Thunderbird ESR (gd) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gd-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gl) | 153.4.0 | [Mozilla Thunderbird ESR (gl) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gl-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (he) | 153.4.0 | [Mozilla Thunderbird ESR (he) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.he-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hr) | 153.4.0 | [Mozilla Thunderbird ESR (hr) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hr-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hsb) | 153.4.0 | [Mozilla Thunderbird ESR (hsb) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hsb-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hu) | 153.4.0 | [Mozilla Thunderbird ESR (hu) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hu-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hy-AM) | 153.4.0 | [Mozilla Thunderbird ESR (hy-AM) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hy-am-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (id) | 153.4.0 | [Mozilla Thunderbird ESR (id) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.id-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (is) | 153.4.0 | [Mozilla Thunderbird ESR (is) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.is-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (it) | 153.4.0 | [Mozilla Thunderbird ESR (it) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.it-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ja) | 153.4.0 | [Mozilla Thunderbird ESR (ja) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ja-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ka) | 153.4.0 | [Mozilla Thunderbird ESR (ka) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ka-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kab) | 153.4.0 | [Mozilla Thunderbird ESR (kab) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kab-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kk) | 153.4.0 | [Mozilla Thunderbird ESR (kk) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kk-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ko) | 153.4.0 | [Mozilla Thunderbird ESR (ko) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ko-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lt) | 153.4.0 | [Mozilla Thunderbird ESR (lt) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lt-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lv) | 153.4.0 | [Mozilla Thunderbird ESR (lv) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lv-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ms) | 153.4.0 | [Mozilla Thunderbird ESR (ms) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ms-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nb-NO) | 153.4.0 | [Mozilla Thunderbird ESR (nb-NO) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nb-no-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nl) | 153.4.0 | [Mozilla Thunderbird ESR (nl) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nl-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nn-NO) | 153.4.0 | [Mozilla Thunderbird ESR (nn-NO) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nn-no-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pa-IN) | 153.4.0 | [Mozilla Thunderbird ESR (pa-IN) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pa-in-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pl) | 153.4.0 | [Mozilla Thunderbird ESR (pl) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pl-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-BR) | 153.4.0 | [Mozilla Thunderbird ESR (pt-BR) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-br-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-PT) | 153.4.0 | [Mozilla Thunderbird ESR (pt-PT) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-pt-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (rm) | 153.4.0 | [Mozilla Thunderbird ESR (rm) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.rm-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ro) | 153.4.0 | [Mozilla Thunderbird ESR (ro) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ro-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ru) | 153.4.0 | [Mozilla Thunderbird ESR (ru) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ru-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sk) | 153.4.0 | [Mozilla Thunderbird ESR (sk) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sk-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sl) | 153.4.0 | [Mozilla Thunderbird ESR (sl) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sl-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sq) | 153.4.0 | [Mozilla Thunderbird ESR (sq) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sq-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sr) | 153.4.0 | [Mozilla Thunderbird ESR (sr) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sr-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sv-SE) | 153.4.0 | [Mozilla Thunderbird ESR (sv-SE) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sv-se-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (th) | 153.4.0 | [Mozilla Thunderbird ESR (th) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.th-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (tr) | 153.4.0 | [Mozilla Thunderbird ESR (tr) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.tr-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uk) | 153.4.0 | [Mozilla Thunderbird ESR (uk) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uk-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uz) | 153.4.0 | [Mozilla Thunderbird ESR (uz) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uz-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (vi) | 153.4.0 | [Mozilla Thunderbird ESR (vi) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.vi-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-CN) | 153.4.0 | [Mozilla Thunderbird ESR (zh-CN) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-cn-153.4.0.md) | Sep 30, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-TW) | 153.4.0 | [Mozilla Thunderbird ESR (zh-TW) 153.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-tw-153.4.0.md) | Sep 30, 2026 |
| macOS | Mozilla Thunderbird | 157.0 | [Mozilla Thunderbird 157.0](https://patchblox.com/security/data/fix/macos/org.mozilla.thunderbird-157.0.md) | Sep 28, 2026 |
| Linux | MozillaThunderbird sles 15.7 | 153.4.0-150400.13.6.1 | [SUSE-SU-2026:4627-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4627-1.md) | Nov 7, 2026 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:140.17.0esr-1~deb12u1 | [DEBIAN-CVE-2026-103500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-103500.md) | Oct 1, 2026 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:140.17.0esr-1~deb13u1 | [DEBIAN-CVE-2026-103500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-103500.md) | Oct 1, 2026 |
| Linux | thunderbird Debian 14 | 1:153.4.0esr-1 | [DEBIAN-CVE-2026-103500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-103500.md) | Oct 1, 2026 |

---

Data as of 2026-11-09T13:31:49Z 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

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