Unrated severityNVD Advisory· Published Oct 27, 2026· Updated Oct 27, 2026

CVE-2026-117866

Description

Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.

Affected products

Mozilla Corporation/Firefox Esrllm-fuzzy
Range: before 115.44
Mozilla Corporation/Firefoxllm-fuzzy
Range: before 159

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvd
www.mozilla.org/security/advisories/mfsa2026-118/nvd
www.mozilla.org/security/advisories/mfsa2026-119/nvd
www.mozilla.org/security/advisories/mfsa2026-120/nvd

News mentions

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