Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefox-x11Upgrade firefoxUpgrade thunderbird | Sep 29, 2025 | Sep 22, 2025 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsource | Sep 30, 2025 | Sep 16, 2025 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Sep 22, 2025 | Sep 22, 2025 |
| Freebsd | — | Upgrade firefox-esrUpgrade thunderbirdUpgrade firefox | Dec 10, 2025 | Oct 17, 2025 |
| Mfsa2025 73 | — | Upgrade to Mozilla Firefox version 143.0 | Sep 17, 2025 | Sep 16, 2025 |
| Mfsa2025 75 | — | Upgrade to Mozilla Firefox ESR version 140.3 | Sep 17, 2025 | Sep 16, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.3 | Sep 17, 2025 | Sep 16, 2025 |
| Oracle_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade firefox | Sep 19, 2025 | Sep 16, 2025 |
| Redhat_linux | — | Upgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade thunderbirdNo solution existsUpgrade firefox-debugsource | Sep 19, 2025 | Sep 16, 2025 |
| Rocky_linux | — | Upgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade firefox-x11Upgrade firefox-debuginfoUpgrade firefox | Feb 5, 2026 | Oct 3, 2025 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade mozillafirefox-translations-otherUpgrade mozillathunderbird-translations-otherUpgrade mozillafirefoxUpgrade mozillafirefox-develUpgrade mozillathunderbirdUpgrade mozillathunderbird-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade mozillafirefox-translations-common | Dec 5, 2025 | Sep 20, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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