Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Feb 27, 2026 | Feb 25, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox | Mar 27, 2026 | Feb 24, 2026 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Feb 27, 2026 | Feb 27, 2026 |
| Mfsa2026 13 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 148.0 | Feb 25, 2026 | Feb 24, 2026 |
| Mfsa2026 14 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 115.33 | Feb 25, 2026 | Feb 24, 2026 |
| Mfsa2026 15 | — | Upgrade to Mozilla Firefox ESR version 140.8Upgrade to the latest version of Mozilla Firefox | Feb 25, 2026 | Feb 24, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.8 | Feb 25, 2026 | Feb 24, 2026 |
| Oracle_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade firefox | Feb 27, 2026 | Feb 24, 2026 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade firefox-x11Upgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade thunderbirdNo solution existsUpgrade firefox-debuginfoUpgrade firefox | Feb 26, 2026 | Feb 24, 2026 |
| Rocky_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debugsource | Mar 2, 2026 | Feb 26, 2026 |
| Suse | — | Upgrade MozillaFirefoxUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaFirefox-devel | Mar 10, 2026 | Feb 26, 2026 |
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