CVE-2026-15788

unknowncovered by 2 sourcesfirst seen 2026-07-14

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.

CSIRTS triage

Other

What: The WCOW cache mount source selector resolves NTFS junctions outside of the cache root.
Who is affected: Deployments using WCOW cache mount functionality.
Urgency: Remediation urgency is unclear due to unknown severity and no exploitation reported.
Action: Monitor for updates regarding this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.

Advisory coverage (2)

unknownCVE-2026-15788: BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does no…nvd · 2026-07-20
unknownCVE-2026-15788: WCOW cache mount source selector resolves NTFS junctions outside of cache rootmsrc · 2026-07-14

External references

NVD record for CVE-2026-15788

CVE.org record

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