CVE-2026-33747

HIGH

8.4

Description

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.

CVE Details

CVSS v3.1 Score8.4

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/27/2026

Last Modified4/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mobyproject:buildkit

Weaknesses (CWE)

CWE-22

References

https://github.com/moby/buildkit/releases/tag/v0.28.1(security-advisories@github.com)

https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj(security-advisories@github.com)

IOC Correlations

No correlations recorded

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