Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-4689

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects 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 0.7%
CVSS Severity
CVSS v3 Score 10.0
Products affected by CVE-2026-4689


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