CVE-2026-15791: Mobyproject Buildkit

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Mobyproject Buildkit: before 0.31.2 (fixed in 0.31.2)

Published 2026-07-21. Last modified 2026-07-30.