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CVE-2026-4689

CRITICAL CVSS: 10.0 Published: 2026-03-24 Modified: 2026-07-15

Description

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.

Affected Platforms

Mozilla FirefoxMozilla Thunderbird

Weakness Type

CWE-190, CWE-754, CWE-120, CWE-190, CWE-190

References