CVE-2026-100819

critical · 9.6

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.

9.6

CVSS

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EPSS (exploit prob.)

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EPSS percentile

2026-09-29

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weaknesses

CWE-119

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2071069
https://www.mozilla.org/security/advisories/mfsa2026-100/
https://www.mozilla.org/security/advisories/mfsa2026-97/
https://www.mozilla.org/security/advisories/mfsa2026-98/
https://www.mozilla.org/security/advisories/mfsa2026-99/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-100819