CVE-2026-40393

Mesa WebGPU Out-of-bounds Memory Access Vulnerability

Published Apr 12, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4679-1 mesa security update
Ubuntu USN Ubuntu USN USN-8427-1 Mesa vulnerability
History
Type Values Removed Values Added
CPEs cpe:2.3:a:mesa3d:mesa:26.0.0:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Mesa WebGPU Out-of-bounds Memory Access Vulnerability
Type Values Removed Values Added
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.
First Time appeared Mesa3d
Mesa3d mesa
Weaknesses CWE-787
CPEs cpe:2.3:a:mesa3d:mesa:*:*:*:*:*:*:*:*
Vendors & Products Mesa3d
Mesa3d mesa
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 13, 2026, 9:05 AM
Reserved
Apr 12, 2026, 6:49 PM
Status
Modified
Published
Apr 12, 2026, 7:16 PM
Modified
Oct 26, 2026, 9:10 PM