CVE-2026-118021

Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

Status

Deferred - security@mozilla.org

Published

2026-10-27

Last modified

2026-10-27

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2076695
• https://www.mozilla.org/security/advisories/mfsa2026-118/
• https://www.mozilla.org/security/advisories/mfsa2026-121/