CVE-2026-61711: Moby Buildkit

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, a custom frontend could place an invalid SecurityMode value in a crafted build request, and executor/oci/spec_linux.go treated the unsupported value as a non-sandbox mode without requiring the security.insecure entitlement. This disabled Seccomp and AppArmor protections for the build container even though Linux capabilities remained restricted. This issue is fixed in version 0.31.1.

Affected products

• Moby Buildkit: before 0.31.1 (fixed in 0.31.1)

Published 2026-08-19. Last modified 2026-09-09.