Path Traversal in Moby Buildkit
CVE-2026-15791
A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.002 (16.0th 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:N/I:H/A:N.
Affected products
- Moby Buildkit — versions 0.10.0
- Mobyproject Buildkit
Weakness classification (CWE)
References
- security@docker.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-15791?
- CVE-2026-15791 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-2026-15791?
- High severity. CVSS v3 base score is 7.5 out of 10.