Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade firefox-x11Upgrade thunderbird | May 24, 2026 | May 20, 2026 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | May 3, 2026 | May 3, 2026 |
| Freebsd | — | Upgrade firefox-esrUpgrade firefox | Apr 30, 2026 | Apr 29, 2026 |
| Mfsa2026 35 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 150.0.1 | Apr 28, 2026 | Apr 28, 2026 |
| Mfsa2026 36 | — | Upgrade to Mozilla Firefox ESR version 140.10.1Upgrade to the latest version of Mozilla Firefox | Apr 28, 2026 | Apr 28, 2026 |
| Mfsa2026 37 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 115.35.1 | Apr 28, 2026 | Apr 28, 2026 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.10.1 | May 3, 2026 | Apr 30, 2026 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | May 28, 2026 | Apr 28, 2026 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11No solution exists | May 20, 2026 | Apr 28, 2026 |
| Rocky_linux | — | Upgrade firefoxUpgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade thunderbird | May 25, 2026 | May 23, 2026 |
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