CVE-2026-33747: BuildKit's Malicious frontend can cause file escape outside of storage root

March 26, 2026 (updated March 27, 2026)

When using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context.

References

github.com/advisories/GHSA-4c29-8rgm-jvjj
github.com/moby/buildkit
github.com/moby/buildkit/releases/tag/v0.28.1
github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj
nvd.nist.gov/vuln/detail/CVE-2026-33747

Code Behaviors & Features

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