What’s Vulnerable › Vulnerabilities
CVE-2026-15788: WCOW cache mount source selector resolves NTFS junctions outside of cache root
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-20 · updated 2026-10-24
- Weakness: CWE-59
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
- moby BuildKit: before 0.31.2 — fixed in 0.31.2
How to fix
Upgrade to a fixed version: moby BuildKit 0.31.2. Check the vendor advisory for mitigations.
References
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