Memory safety bugs present in Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thunderbird 141. 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 142, Firefox ESR 140.2, Thunderbird 142, and Thunderbird 140.2.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsource | Sep 9, 2025 | Aug 19, 2025 |
| Freebsd | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esr | Dec 10, 2025 | Aug 21, 2025 |
| Mfsa2025 64 | — | Upgrade to Mozilla Firefox version 142.0Upgrade to the latest version of Mozilla Firefox | Aug 21, 2025 | Aug 19, 2025 |
| Mfsa2025 67 | — | Upgrade to Mozilla Firefox ESR version 140.2Upgrade to the latest version of Mozilla Firefox | Aug 21, 2025 | Aug 19, 2025 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.2 | Aug 22, 2025 | Aug 19, 2025 |
| Suse | — | Upgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-other | Dec 5, 2025 | Aug 28, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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