What’s Vulnerable › Vulnerabilities

CVE-2026-40393

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-12 · updated 2026-10-26
• Weakness: CWE-787

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.

Affected products

• mesa3d Mesa: before 25.3.6; 26.0.0 — fixed in 25.3.6

How to fix

Upgrade to a fixed version: mesa3d Mesa 25.3.6. Check the vendor advisory for mitigations.

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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