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CVE-2026-15788

WCOW cache mount source selector resolves NTFS junctions outside of cache root

Published: Jul 20, 2026Updated: Aug 5, 2026 Sources: CVE List NVDCWE-59
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 80.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-59

Affected Products

moby
oss-projectaka docker moby
BuildKitOn-prem
Cloud & SaaS / container-orchestration
mobyproject
oss-projectaka docker moby
buildkitOn-prem
Cloud & SaaS / container-orchestration

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2
github.com

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