CVE-2026-40393CWE-787

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…

High · published April 12, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
48.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00615 · 48.8th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-04-12T18:49Z
EPSS history
Timeline
  • 12 APR 18:49Z
    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…
    cvelistv5