Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://www.mozilla.org/security/advisories/mfsa2026-30/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-33/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-36/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-39/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.6 · mozillaNVD modified 2026-10-26 20:10
Affected (CPE criteria) 4
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
References 5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2029461 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-30/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-33/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-36/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-39/ Vendor Advisory