Is CVE-2026-100819 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100819?

CVE-2026-100819 has a CVSS v3 severity of CRITICAL (9.6).

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CVE-2026-100819

Description

Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.