CVE-2026-15788

EUVD-2026-46074
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.
Link Following
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 19.43%
Affected Products (NVD)
VendorProductVersion
mobyprojectbuildkit
𝑥
< 0.31.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2