Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. 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 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefox-x11Upgrade firefoxUpgrade thunderbird | Oct 21, 2025 | Oct 20, 2025 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsource | Oct 28, 2025 | Oct 14, 2025 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Oct 21, 2025 | Oct 21, 2025 |
| Freebsd | — | Upgrade firefox-esrUpgrade thunderbirdUpgrade firefox | Dec 10, 2025 | Oct 17, 2025 |
| Mfsa2025 81 | — | Upgrade to Mozilla Firefox version 144.0Upgrade to the latest version of Mozilla Firefox | Oct 15, 2025 | Oct 14, 2025 |
| Mfsa2025 83 | — | Upgrade to Mozilla Firefox ESR version 140.4Upgrade to the latest version of Mozilla Firefox | Oct 15, 2025 | Oct 14, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.4Upgrade to the latest version of Mozilla Thunderbird | Oct 15, 2025 | Oct 14, 2025 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox-x11Upgrade firefox | Oct 17, 2025 | Oct 14, 2025 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceNo solution existsUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefoxUpgrade firefox-x11Upgrade thunderbird | Oct 16, 2025 | Oct 14, 2025 |
| Rocky_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11Upgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Feb 5, 2026 | Oct 23, 2025 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade MozillaThunderbirdUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade mozillafirefox-branding-upstream | Dec 5, 2025 | Oct 17, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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