Is CVE-2026-109727 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109727?

CVE-2026-109727 has a CVSS v3 severity of MEDIUM (5.4).

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CVE-2026-109727

Description

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.