CVE-2026-0878HIGH 8.0EPSS p34.4%

CVE-2026-0878CVE-2026-0878

mozilla / firefox

Description

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

Scoring

CVSS 3.18.0 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
EPSS0.42% probability of exploitation · percentile 34.4% · 2026-08-03T12:00:16Z
Published2026-01-13
Last modified2026-07-15

Underlying weaknesses· 2

CWE-20CWE-119

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2003989
  2. https://www.mozilla.org/security/advisories/mfsa2026-01/
  3. https://www.mozilla.org/security/advisories/mfsa2026-03/
  4. https://www.mozilla.org/security/advisories/mfsa2026-04/
  5. https://www.mozilla.org/security/advisories/mfsa2026-05/

2

TypeTargetConfidenceTier
WeaknessImproper Restriction of Operations within the Bounds of a Memory Buffercwe-1190%live
WeaknessImproper Input Validationcwe-200%live

Related by meaning· 6

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

CVE
CVE-2026-0879
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CVE-2026-2760
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CVE-2025-14322
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CVE-2026-0880
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CVE-2025-13026
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.