# CVE-2026-15788: WCOW cache mount source selector resolves NTFS junctions outside of cache root

> CVE-2026-15788: WCOW cache mount source selector resolves NTFS junctions outside of cache root. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-15788
Last updated: 2026-10-24T20:10:00Z

- Published: 2026-07-20 19:12 UTC · Updated: 2026-10-24 20:10 UTC · Assigner: Docker
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.41%, 35th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- moby: BuildKit

## Tracked companies

- [Docker](https://rewindex.com/company/docker.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-15788)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-15788)
- [https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2](https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-15788 · Markdown: https://rewindex.com/cve/CVE-2026-15788.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-15788 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:54.127Z