Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11 | Dec 15, 2025 | Dec 10, 2025 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Jan 12, 2026 | Dec 9, 2025 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Dec 12, 2025 | Dec 12, 2025 |
| Freebsd | — | Upgrade thunderbirdUpgrade firefox-esrUpgrade firefox | Jan 27, 2026 | Dec 11, 2025 |
| Mfsa2025 92 | — | Upgrade to Mozilla Firefox version 146.0Upgrade to the latest version of Mozilla Firefox | Dec 10, 2025 | Dec 9, 2025 |
| Mfsa2025 94 | — | Upgrade to Mozilla Firefox ESR version 140.6Upgrade to the latest version of Mozilla Firefox | Dec 10, 2025 | Dec 9, 2025 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.6 | Dec 11, 2025 | Dec 9, 2025 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Dec 11, 2025 | Dec 9, 2025 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade firefox-x11Upgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefoxNo solution existsUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsource | Dec 11, 2025 | Dec 9, 2025 |
| Rocky_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbird-debugsource | Jan 6, 2026 | Jan 5, 2026 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Dec 9, 2025 |
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