CVE-2026-40393

EUVD-2026-21737
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
8.1 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mesa3dmesa
𝑥
< 25.3.6
CNA
mesa3dmesa
26.0.0 ≤
𝑥
< 26.0.1
CNA
Debian logo
Debian Releases
Debian Product
Codename
mesa
bookworm
vulnerable
bullseye
vulnerable
forky
26.0.4-1
fixed
sid
26.0.4-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866
https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html