CVE-2026-0879CRITICAL 9.8EPSS p41.6%

CVE-2026-0879CVE-2026-0879

Description

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

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
EPSS0.55% probability of exploitation · percentile 41.6% · 2026-06-19T12:03:05Z
Published2026-01-13
Last modified2026-04-13

Underlying weaknesses· 1

CWE-119

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2004602
  2. https://www.mozilla.org/security/advisories/mfsa2026-01/
  3. https://www.mozilla.org/security/advisories/mfsa2026-02/
  4. https://www.mozilla.org/security/advisories/mfsa2026-03/
  5. https://www.mozilla.org/security/advisories/mfsa2026-04/
  6. https://www.mozilla.org/security/advisories/mfsa2026-05/

1

TypeTargetConfidenceTier
WeaknessImproper Restriction of Operations within the Bounds of a Memory Buffercwe-1190%live

Related by meaning· 6

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

CVE
CVE-2026-0878
CVE
CVE-2026-0880
CVE
CVE-2026-2760
CVE
CVE-2026-2761
CVE
CVE-2025-13026
CVE
CVE-2025-14322
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.