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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Sep 29, 2025 | Sep 22, 2025 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsource | Sep 30, 2025 | Sep 16, 2025 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Sep 22, 2025 | Sep 22, 2025 |
| Freebsd | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esr | Dec 10, 2025 | Oct 17, 2025 |
| Mfsa2025 73 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 143.0 | Sep 17, 2025 | Sep 16, 2025 |
| Mfsa2025 75 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 140.3 | Sep 17, 2025 | Sep 16, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.3Upgrade to the latest version of Mozilla Thunderbird | Sep 17, 2025 | Sep 16, 2025 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Sep 19, 2025 | Sep 16, 2025 |
| Redhat_linux | — | Upgrade firefox-debugsourceNo solution existsUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox-x11Upgrade firefoxUpgrade thunderbird-debugsource | Sep 19, 2025 | Sep 16, 2025 |
| Rocky_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsourceUpgrade thunderbird-debuginfo | Feb 5, 2026 | Oct 3, 2025 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade MozillaFirefox-develUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaFirefoxUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-common | Dec 5, 2025 | Sep 20, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub