Critical severity10.0NVD Advisory· Published Feb 24, 2026· Updated Apr 13, 2026
CVE-2026-2776
CVE-2026-2776
Description
Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Affected products
4cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <148.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <115.33.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <148.0
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: <140.8.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- www.mozilla.org/security/advisories/mfsa2026-13/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-14/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-15/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-16/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-17/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions Required
News mentions
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