GitHub Advisoryadvisory · Go

GHSA-4c29-8rgm-jvjj BuildKit's Malicious frontend can cause file escape outside of storage root

HIGH Published 2026-03-26 Modified 2026-03-27 Official page ↗
Aliases
CVE-2026-33747
Ecosystem
Go
Packages
github.com/moby/buildkit
Severity
High
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-22
Reviewed
2026-03-26

Affected packages

• Go github.com/moby/buildkit: < 0.28.1 → fixed in 0.28.1

Description

Impact 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. Patches The issue has been fixed in v0.28.1+ Workarounds Issue 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.

Related

Alias · CVE (1)

  • CVE-2026-33747 BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. vulnerability

Weakness · CWE (1)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References