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 v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866	Issue Tracking
https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html	Issue Tracking Mailing List

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mesa3d:mesa::::::::
	cpe:2.3:a:mesa3d:mesa:26.0.0:::::::*

History

16 Apr 2026, 16:17

Type	Values Removed	Values Added
References	~~() https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866 -~~	() https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866 - Issue Tracking
References	~~() https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html -~~	() https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html - Issue Tracking, Mailing List
First Time		Mesa3d mesa Mesa3d
CPE		cpe:2.3:a:mesa3d:mesa:::::::: cpe:2.3:a:mesa3d:mesa:26.0.0:::::::*

12 Apr 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-12 19:16

Updated : 2026-06-17 10:45

NVD link : CVE-2026-40393

Mitre link : CVE-2026-40393

CVE.ORG link : CVE-2026-40393

JSON object : View

Products Affected

mesa3d

mesa

CWE

CWE-787

Out-of-bounds Write

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