CVE-2026-40393

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Summary

CVECVE-2026-40393
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-12 19:16:20 UTC
Updated2026-04-16 16:17:06 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

EPSS: 0.000430000 probability, percentile 0.129070000 (date 2026-04-15)

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mesa3d Mesa All All All All
Application Mesa3d Mesa 26.0.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mesa3d Mesa affected 25.3.6 semver Not specified
CNA Mesa3d Mesa affected 26.0.0 26.0.1 semver Not specified

References

ReferenceSourceLinkTags
lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html [email protected] lists.freedesktop.org Issue Tracking, Mailing List
gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866 [email protected] gitlab.freedesktop.org Issue Tracking
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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