CVE-2026-33747

HIGH

BuildKit vulnerable to malicious frontend causing file escape outside of storage root

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/moby/buildkit/releases/tag/v0.28.1

Scores

CVSS v3 8.4
EPSS 0.0050
EPSS Percentile 38.7%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-22
Status published
Products (3)
moby/buildkit 0 - 0.28.1Go
moby/buildkit < 0.28.1
mobyproject/buildkit < 0.28.1
Published Mar 27, 2026
Tracked Since Mar 27, 2026