Path Traversal in Moby Buildkit
CVE-2026-15789
A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
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:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Moby Buildkit — versions 0
- Mobyproject Buildkit
Weakness classification (CWE)
References
- github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-15789?
- CVE-2026-15789 is a high-severity vulnerability in Moby Buildkit, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-07-21.
- How severe is CVE-2026-15789?
- High severity. CVSS v3 base score is 7.5 out of 10.