Privilege escalation due to use-after-free in the Graphics: Canvas2D component

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-117866 · Microsoft / collected KEV context

cve-program · CVE-2026-117866

• https://bugzilla.mozilla.org/show_bug.cgi?id=2059011
• https://www.mozilla.org/security/advisories/mfsa2026-118/
• https://www.mozilla.org/security/advisories/mfsa2026-119/
• https://www.mozilla.org/security/advisories/mfsa2026-120/
• https://www.mozilla.org/security/advisories/mfsa2026-121/
• https://www.mozilla.org/security/advisories/mfsa2026-122/

• Privilege escalation due to use-after-free in the Graphics: Canvas2D component · Affected-version evidence changed · 27 Oct 2026
• Privilege escalation due to use-after-free in the Graphics: Canvas2D component · Newly collected advisory · 27 Oct 2026