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CVE-2026-4690: Mozilla Firefox, Firefox ESR, and Thunderbird XPCOM Sandbox Escape

A sandbox escape vulnerability, identified as CVE-2026-4690, exists in the XPCOM component of Mozilla Firefox, Firefox ESR, and Thunderbird due to incorrect boundary conditions and an integer overflow, potentially allowing an attacker to execute arbitrary code outside the sandbox.

sandbox escape integer overflow mozilla firefox mozilla thunderbird cve-2026-4690

2r 1t 1i Mar 24, 2026