# CVE-2026-84642: Allowed UNC hostnames for attachments interpreted as a regular expression

CVE-2026-84642 is fixed in 134 products on 3 platforms, first by Mozilla Thunderbird 155.0, released August 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-84642
- Priority: High
- CVSS: 7.5
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 1, 2026
- Weakness: CWE-1333: Inefficient Regular Expression Complexity
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-84642

## Description

The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Thunderbird (af) | 155.0 | [Mozilla Thunderbird (af) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.af-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ar) | 155.0 | [Mozilla Thunderbird (ar) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ar-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ast) | 155.0 | [Mozilla Thunderbird (ast) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ast-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (be) | 155.0 | [Mozilla Thunderbird (be) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.be-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (bg) | 155.0 | [Mozilla Thunderbird (bg) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.bg-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (br) | 155.0 | [Mozilla Thunderbird (br) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.br-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ca) | 155.0 | [Mozilla Thunderbird (ca) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ca-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (cak) | 155.0 | [Mozilla Thunderbird (cak) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cak-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (cs) | 155.0 | [Mozilla Thunderbird (cs) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cs-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (cy) | 155.0 | [Mozilla Thunderbird (cy) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cy-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (da) | 155.0 | [Mozilla Thunderbird (da) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.da-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (de) | 155.0 | [Mozilla Thunderbird (de) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.de-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (dsb) | 155.0 | [Mozilla Thunderbird (dsb) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.dsb-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (el) | 155.0 | [Mozilla Thunderbird (el) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.el-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (en-CA) | 155.0 | [Mozilla Thunderbird (en-CA) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-ca-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (en-GB) | 155.0 | [Mozilla Thunderbird (en-GB) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-gb-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (en-US) | 155.0 | [Mozilla Thunderbird (en-US) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (es-AR) | 155.0 | [Mozilla Thunderbird (es-AR) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-ar-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (es-ES) | 155.0 | [Mozilla Thunderbird (es-ES) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-es-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (es-MX) | 155.0 | [Mozilla Thunderbird (es-MX) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-mx-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (et) | 155.0 | [Mozilla Thunderbird (et) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.et-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (eu) | 155.0 | [Mozilla Thunderbird (eu) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.eu-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (fi) | 155.0 | [Mozilla Thunderbird (fi) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fi-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (fr) | 155.0 | [Mozilla Thunderbird (fr) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fr-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (fy-NL) | 155.0 | [Mozilla Thunderbird (fy-NL) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fy-nl-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ga-IE) | 155.0 | [Mozilla Thunderbird (ga-IE) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ga-ie-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (gd) | 155.0 | [Mozilla Thunderbird (gd) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gd-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (gl) | 155.0 | [Mozilla Thunderbird (gl) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gl-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (he) | 155.0 | [Mozilla Thunderbird (he) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.he-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (hr) | 155.0 | [Mozilla Thunderbird (hr) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hr-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (hsb) | 155.0 | [Mozilla Thunderbird (hsb) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hsb-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (hu) | 155.0 | [Mozilla Thunderbird (hu) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hu-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (hy-AM) | 155.0 | [Mozilla Thunderbird (hy-AM) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hy-am-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (id) | 155.0 | [Mozilla Thunderbird (id) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.id-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (is) | 155.0 | [Mozilla Thunderbird (is) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.is-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (it) | 155.0 | [Mozilla Thunderbird (it) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.it-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ja) | 155.0 | [Mozilla Thunderbird (ja) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ja-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ka) | 155.0 | [Mozilla Thunderbird (ka) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ka-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (kab) | 155.0 | [Mozilla Thunderbird (kab) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kab-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (kk) | 155.0 | [Mozilla Thunderbird (kk) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kk-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ko) | 155.0 | [Mozilla Thunderbird (ko) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ko-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (lt) | 155.0 | [Mozilla Thunderbird (lt) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lt-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (lv) | 155.0 | [Mozilla Thunderbird (lv) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lv-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ms) | 155.0 | [Mozilla Thunderbird (ms) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ms-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (nb-NO) | 155.0 | [Mozilla Thunderbird (nb-NO) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nb-no-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (nl) | 155.0 | [Mozilla Thunderbird (nl) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nl-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (nn-NO) | 155.0 | [Mozilla Thunderbird (nn-NO) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nn-no-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (pa-IN) | 155.0 | [Mozilla Thunderbird (pa-IN) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pa-in-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (pl) | 155.0 | [Mozilla Thunderbird (pl) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pl-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (pt-BR) | 155.0 | [Mozilla Thunderbird (pt-BR) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-br-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (pt-PT) | 155.0 | [Mozilla Thunderbird (pt-PT) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-pt-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (rm) | 155.0 | [Mozilla Thunderbird (rm) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.rm-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ro) | 155.0 | [Mozilla Thunderbird (ro) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ro-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (ru) | 155.0 | [Mozilla Thunderbird (ru) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ru-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (sk) | 155.0 | [Mozilla Thunderbird (sk) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sk-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (sl) | 155.0 | [Mozilla Thunderbird (sl) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sl-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (sq) | 155.0 | [Mozilla Thunderbird (sq) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sq-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (sr) | 155.0 | [Mozilla Thunderbird (sr) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sr-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (sv-SE) | 155.0 | [Mozilla Thunderbird (sv-SE) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sv-se-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (th) | 155.0 | [Mozilla Thunderbird (th) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.th-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (tr) | 155.0 | [Mozilla Thunderbird (tr) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.tr-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (uk) | 155.0 | [Mozilla Thunderbird (uk) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uk-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (uz) | 155.0 | [Mozilla Thunderbird (uz) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uz-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (vi) | 155.0 | [Mozilla Thunderbird (vi) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.vi-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (zh-CN) | 155.0 | [Mozilla Thunderbird (zh-CN) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-cn-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird (zh-TW) | 155.0 | [Mozilla Thunderbird (zh-TW) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-tw-155.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (af) | 153.2.0 | [Mozilla Thunderbird ESR (af) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.af-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ar) | 153.2.0 | [Mozilla Thunderbird ESR (ar) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ar-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ast) | 153.2.0 | [Mozilla Thunderbird ESR (ast) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ast-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (be) | 153.2.0 | [Mozilla Thunderbird ESR (be) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.be-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (bg) | 153.2.0 | [Mozilla Thunderbird ESR (bg) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.bg-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (br) | 153.2.0 | [Mozilla Thunderbird ESR (br) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.br-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ca) | 153.2.0 | [Mozilla Thunderbird ESR (ca) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ca-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cak) | 153.2.0 | [Mozilla Thunderbird ESR (cak) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cak-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cs) | 153.2.0 | [Mozilla Thunderbird ESR (cs) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cs-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cy) | 153.2.0 | [Mozilla Thunderbird ESR (cy) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cy-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (da) | 153.2.0 | [Mozilla Thunderbird ESR (da) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.da-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (de) | 153.2.0 | [Mozilla Thunderbird ESR (de) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.de-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (dsb) | 153.2.0 | [Mozilla Thunderbird ESR (dsb) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.dsb-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (el) | 153.2.0 | [Mozilla Thunderbird ESR (el) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.el-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-CA) | 153.2.0 | [Mozilla Thunderbird ESR (en-CA) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-ca-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-GB) | 153.2.0 | [Mozilla Thunderbird ESR (en-GB) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-gb-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-US) | 153.2.0 | [Mozilla Thunderbird ESR (en-US) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-AR) | 153.2.0 | [Mozilla Thunderbird ESR (es-AR) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-ar-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-ES) | 153.2.0 | [Mozilla Thunderbird ESR (es-ES) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-es-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-MX) | 153.2.0 | [Mozilla Thunderbird ESR (es-MX) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-mx-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (et) | 153.2.0 | [Mozilla Thunderbird ESR (et) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.et-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (eu) | 153.2.0 | [Mozilla Thunderbird ESR (eu) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.eu-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fi) | 153.2.0 | [Mozilla Thunderbird ESR (fi) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fi-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fr) | 153.2.0 | [Mozilla Thunderbird ESR (fr) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fr-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fy-NL) | 153.2.0 | [Mozilla Thunderbird ESR (fy-NL) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fy-nl-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ga-IE) | 153.2.0 | [Mozilla Thunderbird ESR (ga-IE) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ga-ie-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gd) | 153.2.0 | [Mozilla Thunderbird ESR (gd) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gd-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gl) | 153.2.0 | [Mozilla Thunderbird ESR (gl) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gl-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (he) | 153.2.0 | [Mozilla Thunderbird ESR (he) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.he-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hr) | 153.2.0 | [Mozilla Thunderbird ESR (hr) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hr-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hsb) | 153.2.0 | [Mozilla Thunderbird ESR (hsb) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hsb-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hu) | 153.2.0 | [Mozilla Thunderbird ESR (hu) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hu-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hy-AM) | 153.2.0 | [Mozilla Thunderbird ESR (hy-AM) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hy-am-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (id) | 153.2.0 | [Mozilla Thunderbird ESR (id) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.id-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (is) | 153.2.0 | [Mozilla Thunderbird ESR (is) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.is-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (it) | 153.2.0 | [Mozilla Thunderbird ESR (it) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.it-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ja) | 153.2.0 | [Mozilla Thunderbird ESR (ja) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ja-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ka) | 153.2.0 | [Mozilla Thunderbird ESR (ka) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ka-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kab) | 153.2.0 | [Mozilla Thunderbird ESR (kab) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kab-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kk) | 153.2.0 | [Mozilla Thunderbird ESR (kk) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kk-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ko) | 153.2.0 | [Mozilla Thunderbird ESR (ko) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ko-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lt) | 153.2.0 | [Mozilla Thunderbird ESR (lt) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lt-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lv) | 153.2.0 | [Mozilla Thunderbird ESR (lv) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lv-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ms) | 153.2.0 | [Mozilla Thunderbird ESR (ms) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ms-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nb-NO) | 153.2.0 | [Mozilla Thunderbird ESR (nb-NO) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nb-no-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nl) | 153.2.0 | [Mozilla Thunderbird ESR (nl) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nl-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nn-NO) | 153.2.0 | [Mozilla Thunderbird ESR (nn-NO) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nn-no-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pa-IN) | 153.2.0 | [Mozilla Thunderbird ESR (pa-IN) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pa-in-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pl) | 153.2.0 | [Mozilla Thunderbird ESR (pl) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pl-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-BR) | 153.2.0 | [Mozilla Thunderbird ESR (pt-BR) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-br-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-PT) | 153.2.0 | [Mozilla Thunderbird ESR (pt-PT) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-pt-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (rm) | 153.2.0 | [Mozilla Thunderbird ESR (rm) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.rm-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ro) | 153.2.0 | [Mozilla Thunderbird ESR (ro) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ro-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ru) | 153.2.0 | [Mozilla Thunderbird ESR (ru) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ru-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sk) | 153.2.0 | [Mozilla Thunderbird ESR (sk) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sk-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sl) | 153.2.0 | [Mozilla Thunderbird ESR (sl) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sl-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sq) | 153.2.0 | [Mozilla Thunderbird ESR (sq) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sq-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sr) | 153.2.0 | [Mozilla Thunderbird ESR (sr) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sr-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sv-SE) | 153.2.0 | [Mozilla Thunderbird ESR (sv-SE) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sv-se-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (th) | 153.2.0 | [Mozilla Thunderbird ESR (th) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.th-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (tr) | 153.2.0 | [Mozilla Thunderbird ESR (tr) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.tr-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uk) | 153.2.0 | [Mozilla Thunderbird ESR (uk) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uk-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uz) | 153.2.0 | [Mozilla Thunderbird ESR (uz) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uz-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (vi) | 153.2.0 | [Mozilla Thunderbird ESR (vi) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.vi-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-CN) | 153.2.0 | [Mozilla Thunderbird ESR (zh-CN) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-cn-153.2.0.md) | Sep 1, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-TW) | 153.2.0 | [Mozilla Thunderbird ESR (zh-TW) 153.2.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-tw-153.2.0.md) | Sep 1, 2026 |
| macOS | Mozilla Thunderbird | 155.0 | [Mozilla Thunderbird 155.0](https://patchblox.com/security/data/fix/macos/org.mozilla.thunderbird-155.0.md) | Aug 28, 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 |

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Data as of 2026-11-08T13:06:02Z 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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