CVE-2026-8956CRITICAL 9.8EPSS p44.3%

CVE-2026-8956CVE-2026-8956

Description

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

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
EPSS0.60% probability of exploitation · percentile 44.3% · 2026-06-19T12:03:05Z
Published2026-05-19
Last modified2026-05-20

Underlying weaknesses· 1

CWE-190

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2032427
  2. https://www.mozilla.org/security/advisories/mfsa2026-46/
  3. https://www.mozilla.org/security/advisories/mfsa2026-48/
  4. https://www.mozilla.org/security/advisories/mfsa2026-50/
  5. https://www.mozilla.org/security/advisories/mfsa2026-51/

1

TypeTargetConfidenceTier
WeaknessInteger Overflow or Wraparoundcwe-1900%live

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