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CVE-2026-8091

Critical · CVSS 9.8

Mozilla Firefox / Thunderbird — Incorrect boundary conditions (CWE-754, CWE-805) in Audio/Video Playback component

CVSS
9.8
nvd
EPSS
0.47%
38th pct
KEV
No
Class
other
NVD-CWE-noinfo, CWE-754, CWE-805

Description

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

Search profile — drives PoC discovery

Symbols Audio/Video Playbackmfsa2026-30mfsa2026-33mfsa2026-36mfsa2026-39bug 2029301
Keywords CVE-2026-8091Firefox 150Thunderbird 150Firefox ESR 140.10.1Firefox ESR 115.35.2audio video playback boundary conditionincorrect boundary check media playback MozillaCWE-805 buffer size validation Firefoxmfsa2026-30bugzilla 2029301
Versions: Firefox < 150, Thunderbird < 150, Firefox ESR < 140.10.1, Thunderbird ESR < 140.10.1, Firefox ESR < 115.35.2

References

Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T18:30:14.000Z