CVE-2026-40393

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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-26)

CWE

CWE-787

Published

2026-04-12

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• mesa3d:mesa

References

• https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866
• https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html
• https://lists.debian.org/debian-lts-announce/2026/07/msg00021.html

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