Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Jan 20, 2026 | Jan 15, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox | Feb 20, 2026 | Jan 13, 2026 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jan 19, 2026 | Jan 19, 2026 |
| Freebsd | — | Upgrade firefox-esrUpgrade thunderbirdUpgrade firefox | Jan 27, 2026 | Jan 15, 2026 |
| Mfsa2026 01 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 147.0 | Jan 14, 2026 | Jan 13, 2026 |
| Mfsa2026 03 | — | Upgrade to Mozilla Firefox ESR version 140.7Upgrade to the latest version of Mozilla Firefox | Jan 14, 2026 | Jan 13, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.7 | Jan 16, 2026 | Jan 13, 2026 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Jan 19, 2026 | Jan 13, 2026 |
| Redhat_linux | — | Upgrade thunderbirdNo solution existsUpgrade firefox-x11Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsource | Jan 16, 2026 | Jan 13, 2026 |
| Rocky_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade firefox-debugsourceUpgrade firefox-debuginfo | Jan 19, 2026 | Jan 16, 2026 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-common | Jan 15, 2026 | Jan 15, 2026 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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