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.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| 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 firefoxUpgrade firefox-debugsource | Mar 27, 2026 | Feb 24, 2026 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | 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 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 thunderbirdUpgrade firefoxUpgrade firefox-x11 | Feb 27, 2026 | Feb 24, 2026 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debugsourceUpgrade firefox-x11No solution existsUpgrade firefox-debuginfoUpgrade thunderbird-debugsource | Feb 26, 2026 | Feb 24, 2026 |
| Rocky_linux | — | Upgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbird-debugsource | Mar 2, 2026 | Feb 26, 2026 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade MozillaThunderbirdUpgrade MozillaFirefox-develUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-other | Mar 10, 2026 | Feb 26, 2026 |
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