CVE-2026-15788: CWE-59: Improper Link Resolution Before File Access ('Link Following') in moby BuildKit
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.
CVE-2026-15788: CWE-59: Improper Link Resolution Before File Access ('Link Following') in moby BuildKit
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.
CVSS v4.0
Score 5.6medium
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Docker
- Date Reserved
- 2026-07-14T19:25:38.521Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5e7dae2a4a8d5989a50ded
Added to database: 07/20/2026, 19:57:34 UTC
Last enriched: 07/20/2026, 20:13:12 UTC
Last updated: 09/04/2026, 22:52:09 UTC
Views: 66
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