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CVE-2026-33747

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

Published: Mar 27, 2026Updated: Apr 1, 2026 Sources: CVE List NVD BDUCWE-22
NVD MITRE
8.4CVSSHIGH
EPSS Score
0.5%
Top 61.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-22

Affected Products

buildkitmoby
On-prem
Cloud & SaaS / container-orchestration
buildkitmobyproject
On-prem
Cloud & SaaS / container-orchestration
Red Hat QuayRed Hat Inc.
On-premWeb App
DevTools & CI / artifact-registry
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Red Hat Openshift Data FoundationRed Hat Inc.
On-prem
Cloud & SaaS / container-orchestration
mobyoss-projectCloud & SaaSaka docker moby
mobyprojectoss-projectCloud & SaaSaka docker moby
red hat inc.commercialUSOperating Systemsaka red hat
ооо «ред софт»commercialRUOperating Systemsaka red soft
and 18 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj
github.com
https://github.com/moby/buildkit/releases/tag/v0.28.1
github.com
https://github.com/moby/buildkit
github.com
and 4 more references View all →

Timeline

Published
Mar 27, 2026
Last Updated
Apr 1, 2026

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