CVE-2026-4718HIGH 8.1EPSS p21.3%

CVE-2026-4718CVE-2026-4718

Description

Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS0.30% probability of exploitation · percentile 21.3% · 2026-06-19T12:03:05Z
Published2026-03-24
Last modified2026-04-13

Underlying weaknesses· 1

CWE-758

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2014864
  2. https://www.mozilla.org/security/advisories/mfsa2026-20/
  3. https://www.mozilla.org/security/advisories/mfsa2026-22/
  4. https://www.mozilla.org/security/advisories/mfsa2026-23/
  5. https://www.mozilla.org/security/advisories/mfsa2026-24/

1

TypeTargetConfidenceTier
WeaknessReliance on Undefined, Unspecified, or Implementation-Defined Behaviorcwe-7580%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.