CVE-2026-40393CRITICAL 8.1EPSS p35.2%

CVE-2026-40393CVE-2026-40393

mesa3d / mesa

Description

In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, and is then used for alloca.

Scoring

CVSS 3.18.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.43% probability of exploitation · percentile 35.2% · 2026-08-03T12:00:16Z
Published2026-04-12
Last modified2026-07-13

Underlying weaknesses· 1

CWE-787

References

  1. https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866
  2. https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html

1

TypeTargetConfidenceTier
WeaknessOut-of-bounds Writecwe-7870%live

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