CVE-2026-40393
9.8
CRITICAL
CVSS 3.1
EPSS 0.06%
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.
How to fix CVE-2026-40393
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/mesa—no fix listed
Is CVE-2026-40393 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |