CVE-2026-2766CRITICAL 9.8EPSS p35.9%

CVE-2026-2766CVE-2026-2766

Description

Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

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
EPSS0.45% probability of exploitation · percentile 35.9% · 2026-06-19T12:03:05Z
Published2026-02-24
Last modified2026-04-13

Underlying weaknesses· 1

CWE-416

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2013583
  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/

1

TypeTargetConfidenceTier
WeaknessUse After Freecwe-4160%live

Related by meaning· 6

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

CVE
CVE-2026-2764
CVE
CVE-2026-2765
CVE
CVE-2026-2786
CVE
CVE-2026-2763
CVE
CVE-2026-2758
CVE
CVE-2026-2797
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.