Medium [CVE-2026-15788] BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root
This medium-severity Docker advisory covers CVE-2026-15788 affecting BuildKit.
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Summary
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.
- BuildKit before 0.31.2
NVD record · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 0.31.2. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
NVD record · high-confidence parse· fetched 2 months ago·verify at source
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