Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade firefox-x11Upgrade thunderbird | Oct 11, 2026 | Sep 21, 2026 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Sep 21, 2026 | Sep 15, 2026 |
| Mfsa2026 90 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 156.0 | Sep 15, 2026 | Sep 15, 2026 |
| Mfsa2026 92 | — | Upgrade to Mozilla Firefox ESR version 140.16Upgrade to the latest version of Mozilla Firefox | Sep 15, 2026 | Sep 15, 2026 |
| Mfsa2026 93 | — | Upgrade to Mozilla Firefox ESR version 153.3Upgrade to the latest version of Mozilla Firefox | Sep 15, 2026 | Sep 15, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 153.3 | Sep 15, 2026 | Sep 15, 2026 |
| Redhat_linux | — | Upgrade thunderbird-debuginfoNo solution existsUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade firefox-debugsourceUpgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox | Sep 18, 2026 | Sep 15, 2026 |
| Rocky_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade firefoxUpgrade thunderbird | Sep 28, 2026 | Sep 26, 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