High severity8.8NVD Advisory· Published Sep 29, 2026· Updated Sep 29, 2026

CVE-2026-100780

Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy
Range: up to 153.4 (ESR), up to 157 (Firefox), up to 115.42 (ESR), up to 140.17 (ESR)
Mozilla Corporation/Firefox Esrllm-fuzzy
Range: up to 153.4, up to 115.42, up to 140.17

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvd
www.mozilla.org/security/advisories/mfsa2026-100/nvd
www.mozilla.org/security/advisories/mfsa2026-97/nvd
www.mozilla.org/security/advisories/mfsa2026-98/nvd
www.mozilla.org/security/advisories/mfsa2026-99/nvd

News mentions

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