Is CVE-2026-100791 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100791?

CVE-2026-100791 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-100791

Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.