CVE-2026-4716CRITICAL 9.1EPSS p32.3%

CVE-2026-4716CVE-2026-4716

Description

Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS0.41% probability of exploitation · percentile 32.3% · 2026-06-19T12:03:05Z
Published2026-03-24
Last modified2026-04-13

Underlying weaknesses· 1

CWE-908

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2018592
  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
WeaknessUse of Uninitialized Resourcecwe-9080%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.