CVE-2026-2778CRITICAL 10.0EPSS p38.1%

CVE-2026-2778CVE-2026-2778

Description

Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Scoring

CVSS 3.110.0 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS0.49% probability of exploitation · percentile 38.1% · 2026-06-19T12:03:05Z
Published2026-02-24
Last modified2026-04-13

Underlying weaknesses· 1

CWE-119

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2016358
  2. https://www.mozilla.org/security/advisories/mfsa2026-13/
  3. https://www.mozilla.org/security/advisories/mfsa2026-14/
  4. https://www.mozilla.org/security/advisories/mfsa2026-15/
  5. https://www.mozilla.org/security/advisories/mfsa2026-16/
  6. https://www.mozilla.org/security/advisories/mfsa2026-17/

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.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.