Is CVE-2026-16363 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16363?

CVE-2026-16363 has a CVSS v3 severity of CRITICAL (9.8).

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Description

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.