CVE-2026-8091CRITICAL 9.8EPSS p37.4%

CVE-2026-8091CVE-2026-8091

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.48% probability of exploitation · percentile 37.4% · 2026-06-19T12:03:05Z
Published2026-05-07
Last modified2026-05-11

Underlying weaknesses· 1

CWE-754

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2029301
  2. https://www.mozilla.org/security/advisories/mfsa2026-30/
  3. https://www.mozilla.org/security/advisories/mfsa2026-33/
  4. https://www.mozilla.org/security/advisories/mfsa2026-36/
  5. https://www.mozilla.org/security/advisories/mfsa2026-39/
  6. https://www.mozilla.org/security/advisories/mfsa2026-42/

1

TypeTargetConfidenceTier
WeaknessImproper Check for Unusual or Exceptional Conditionscwe-7540%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.