Use-after-free in the Networking 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 |
| Amazon_linux_2023 | — | Upgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsource | Oct 13, 2026 | Sep 15, 2026 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | 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 the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 140.16 | Sep 15, 2026 | Sep 15, 2026 |
| Mfsa2026 93 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 153.3 | 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 thunderbirdUpgrade thunderbird-debugsourceUpgrade firefoxNo solution existsUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-x11 | Sep 18, 2026 | Sep 15, 2026 |
| Rocky_linux | — | Upgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11 | 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