CVE-2026-7321CRITICAL 9.6EPSS p17.0%

CVE-2026-7321CVE-2026-7321

Description

Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.

Scoring

CVSS 3.19.6 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS0.26% probability of exploitation · percentile 17.0% · 2026-06-18T12:00:27Z
Published2026-04-28
Last modified2026-05-01

Underlying weaknesses· 1

CWE-120

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2029461
  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/

1

TypeTargetConfidenceTier
WeaknessBuffer Copy without Checking Size of Input ('Classic Buffer Overflow')cwe-1200%live

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