[ CVE-2026-100775 · Published 29 Sep 2026 ]
Vulnerability in Mozilla Firefox
[ Why it matters ]Priority signals
- Critical severity: CVSS 9.6
[ Description ]Official description
Sandbox escape in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1244
Multiple vulnerabilities in Mozilla Thunderbird Translated from French
Multiple vulnerabilities have been discovered in Mozilla Thunderbird. Some of them allow an attacker to cause privilege escalation, remote denial of service and a breach of data confidentiality.
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CERT-FRCERTFR-2026-AVI-1240
Multiple vulnerabilities in Mozilla products Translated from French
Multiple vulnerabilities have been discovered in Mozilla products. Some of them allow an attacker to cause privilege escalation, remote denial of service and a breach of data confidentiality.
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BSI CERT-BundWID-SEC-2026-3654
Mozilla Firefox, Firefox ESR and Thunderbird: Multiple vulnerabilities Translated from German
[ References ]References
- bugzilla.mozilla.org/show_bug.cgiPermissions Required
- www.mozilla.org/security/advisories/mfsa2026-100Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-101Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-102Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-103Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-97Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-98Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-99Vendor Advisory