CVE-2026-124903
CriticalCVSS 9.6Summary
A sandbox escape due to a use-after-free exists in the IPC component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
Risk Assessment
A sandbox escape via use-after-free may allow an attacker to bypass isolation and access system resources. It affects Firefox and Firefox ESR users.
Recommendation
Update Firefox to version 160 or later and Firefox ESR to version 115.45 or 153.7 (or later).
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Original NVD description (English source)
Sandbox escape due to use-after-free in the IPC component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

