Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 148, 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 firefoxUpgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Mar 27, 2026 | Feb 24, 2026 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Feb 27, 2026 | Feb 27, 2026 |
| Mfsa2026 13 | — | Upgrade to Mozilla Firefox version 148.0Upgrade to the latest version of Mozilla Firefox | 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 thunderbirdNo solution existsUpgrade firefox-debugsourceUpgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbird-debugsource | Feb 26, 2026 | Feb 24, 2026 |
| Rocky_linux | — | Upgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade thunderbird-debugsourceUpgrade firefox-debuginfo | Mar 2, 2026 | Feb 26, 2026 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-openpgp-librnp | Mar 10, 2026 | Feb 26, 2026 |
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