Critical severity9.6NVD Advisory· Published Sep 29, 2026· Updated Sep 29, 2026

CVE-2026-100819

Description

Sandbox escape due to incorrect boundary conditions in the XPCOM 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/Firefox Esrllm-fuzzy
Range: up to 153.4, up to 115.42, up to 140.17
Mozilla Corporation/Firefoxllm-fuzzy
Range: up to 157

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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cvss	0.624
epss	0.000
exploit	0.000
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ransomware	0.000