Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-4689

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.7%
CVSS Severity
CVSS v3 Score 10.0
Products affected by CVE-2026-4689


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