Vulnerability in Moby Buildkit
CVE-2026-15788
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.
EPSS: 0.003 (19.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Moby Buildkit — versions 0
- Mobyproject Buildkit
Weakness classification (CWE)
References
- security@docker.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-15788?
- CVE-2026-15788 is a high-severity vulnerability in Moby Buildkit, classified under Improper Link Resolution Before File Access. CVSS score: 7.5/10. Published 2026-07-20.
- How severe is CVE-2026-15788?
- High severity. CVSS v3 base score is 7.5 out of 10.