CVE-2026-4689criticalCWE-120 CWE-190

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 10epss 0.7%

exploitation probability

0.7%top 50% of all CVEs

observed exploitation

nono source reports it

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

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

Affected products

Mozilla · Firefox Mozilla · Thunderbird

References