CVE-2026-15788CWE-59

CVE-2026-15788

High · published July 21, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
34.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00411 · 34.2th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-07-21T00:16Z
Affected products (1)
ProductVersionsFixed in
mobyproject/buildkit< 0.31.20.31.2
References (1)
https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2 · [email protected]
EPSS history
Timeline
  • 20 JUL 19:12Z
    WCOW cache mount source selector resolves NTFS junctions outside of cache root
    cvelistv5