CVE-2026-2799 (CRITICAL 9.8) · Watchpost

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CVE-2026-2799

CRITICAL 9.8CVE-2026-2799 · Published 24/02/2026 · updated 15/07/2026

Package	Affected versions	Patched versions
firefox mozilla	`< 148.0`	`148.0`
thunderbird mozilla	`< 148.0`	`148.0`

Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
access.redhat.com/security/cve/CVE-2026-2799
bugzilla.redhat.com/show_bug.cgi
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2799.json

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