Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. 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 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade firefox-x11Upgrade thunderbird | Aug 5, 2026 | Aug 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade firefox | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade firefoxUpgrade firefox-debugsourceUpgrade firefox-debuginfo | Aug 18, 2026 | Jul 21, 2026 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jul 23, 2026 | Jul 23, 2026 |
| Freebsd | — | Upgrade thunderbirdUpgrade firefox-esrUpgrade firefox | Jul 29, 2026 | Jul 28, 2026 |
| Mfsa2026 68 | — | Upgrade to Mozilla Firefox version 153.0Upgrade to the latest version of Mozilla Firefox | Jul 21, 2026 | Jul 21, 2026 |
| Mfsa2026 70 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 140.13 | Jul 21, 2026 | Jul 21, 2026 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.13Upgrade to the latest version of Mozilla Thunderbird | Jul 21, 2026 | Jul 21, 2026 |
| Oracle_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade firefox | Oct 22, 2026 | Jul 21, 2026 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade thunderbird-debuginfoNo solution existsUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsource | Jul 27, 2026 | Jul 21, 2026 |
| Rocky_linux | — | Upgrade firefox-x11Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debuginfo | Jul 31, 2026 | Jul 29, 2026 |
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