Memory safety bugs present in Thunderbird ESR 140.12. 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 ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefox-x11Upgrade firefoxUpgrade thunderbird | Aug 5, 2026 | Aug 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade firefox | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade firefoxUpgrade firefox-debuginfo | Aug 18, 2026 | Jul 21, 2026 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jul 23, 2026 | Jul 23, 2026 |
| Mfsa2026 69 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 115.38 | Jul 21, 2026 | Jul 21, 2026 |
| Mfsa2026 70 | — | Upgrade to Mozilla Firefox ESR version 140.13Upgrade to the latest version of Mozilla Firefox | Jul 21, 2026 | Jul 21, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.13 | Jul 21, 2026 | Jul 21, 2026 |
| Oracle_linux | — | Upgrade firefoxUpgrade firefox-x11Upgrade thunderbird | Oct 22, 2026 | Jul 21, 2026 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefox-x11No solution existsUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsource | Jul 27, 2026 | Jul 21, 2026 |
| Rocky_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsource | Jul 31, 2026 | Jul 29, 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