Unrated severityNVD Advisory· Published Jul 20, 2026· Updated Jul 21, 2026
WCOW cache mount source selector resolves NTFS junctions outside of cache root
CVE-2026-15788
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.
Affected products
1Patches
Vulnerability mechanics
References
1- github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2mitrevendor-advisory
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