BuildKit improperly handles special files in build snapshots

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93320
StatePUBLISHED
AssignerDocker
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-05 18:17:38 UTC
Updated2026-10-06 15:08:38 UTC
DescriptionBuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.

Risk And Classification

Primary CVSS: v4.0 6 MEDIUM from [email protected]

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001140000 probability, percentile 0.013490000 (date 2026-10-06)

Problem Types: CWE-441 | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H/E:X/C...
4.0CNACVSS6MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Active
Confidentiality
None
Integrity
Low
Availability
Low
Sub Conf.
None
Sub Integrity
High
Sub Availability
High

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Moby BuildKit affected 0.33.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/moby/buildkit/releases/tag/v0.33.1 [email protected] github.com
github.com/moby/buildkit/security/advisories/GHSA-9728-qjrv-2xh2 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Daniele Linguaglossa (https://github.com/dzonerzy) (en)

Additional Advisory Data

Workarounds

CNA: Avoid untrusted builds. Rootless mode mitigates device access but not denial of service.

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