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CVE-2026-33747 — BuildKit vulnerable to malicious frontend causing file escape outside of storage root

2026-10-03T10:47:26.891300+00:00

Affected: moby buildkit

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, 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. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.

USN-8230-1 — docker.io-app vulnerabilities

2026-10-03T10:47:26.891386+00:00

Affected: Ubuntu:Pro:20.04:LTS: docker.io-app, Ubuntu:22.04:LTS: docker.io-app, Ubuntu:24.04:LTS: docker.io-app, Ubuntu:26.04:LTS: docker.io-app

It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. (CVE-2026-33747)

It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. (CVE-2026-33748)