CVE-2026-15789: Mobyproject Buildkit

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Mobyproject Buildkit: before 0.31.2 (fixed in 0.31.2)

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