CVE-2026-2781CRITICAL 9.8EPSS p27.7%

CVE-2026-2781CVE-2026-2781

Description

Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.

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
EPSS0.36% probability of exploitation · percentile 27.7% · 2026-06-18T12:00:27Z
Published2026-02-24
Last modified2026-04-21

Underlying weaknesses· 1

CWE-190

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2009552
  2. https://www.mozilla.org/security/advisories/mfsa2026-13/
  3. https://www.mozilla.org/security/advisories/mfsa2026-15/
  4. https://www.mozilla.org/security/advisories/mfsa2026-16/
  5. https://www.mozilla.org/security/advisories/mfsa2026-17/
  6. https://www.mozilla.org/security/advisories/mfsa2026-31/
  7. https://lists.debian.org/debian-lts-announce/2026/03/msg00012.html

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.