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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-debugsourceUpgrade firefoxUpgrade firefox-debuginfo | Oct 28, 2025 | Oct 14, 2025 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Oct 21, 2025 | Oct 21, 2025 |
| Freebsd | — | Upgrade firefoxUpgrade firefox-esrUpgrade thunderbird | 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 firefox-x11Upgrade thunderbirdUpgrade firefox | Oct 17, 2025 | Oct 14, 2025 |
| Redhat_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debugsourceNo solution existsUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbirdUpgrade firefox-x11 | Oct 16, 2025 | Oct 14, 2025 |
| Rocky_linux | — | Upgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Feb 5, 2026 | Oct 23, 2025 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaThunderbirdUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox | Dec 5, 2025 | Oct 17, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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