CVE-2026-6748CRITICAL 9.8EPSS p30.5%

CVE-2026-6748CVE-2026-6748

Description

Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

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
EPSS0.39% probability of exploitation · percentile 30.5% · 2026-06-19T12:03:05Z
Published2026-04-21
Last modified2026-04-22

Underlying weaknesses· 1

CWE-457

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2022604
  2. https://www.mozilla.org/security/advisories/mfsa2026-30/
  3. https://www.mozilla.org/security/advisories/mfsa2026-32/
  4. https://www.mozilla.org/security/advisories/mfsa2026-33/
  5. https://www.mozilla.org/security/advisories/mfsa2026-34/

1

TypeTargetConfidenceTier
WeaknessUse of Uninitialized Variablecwe-4570%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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