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CVE

CVE-2026-33747

BuildKit's Malicious frontend can cause file escape outside of storage root
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CVE

CVE-2026-33747

BuildKit's Malicious frontend can cause file escape outside of storage root

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.4
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
8.4
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj, https://nvd.nist.gov/vuln/detail/CVE-2026-33747, https://github.com/moby/buildkit, https://github.com/moby/buildkit/releases/tag/v0.28.1

Severity

8.4

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.4
EPSS Probability
0.00063%
EPSS Percentile
0.19752%
Introduced Version
0,v0.0.0-20230816085755-6b27487fec53,v0.13.0-beta1,v0.0.0-20171203035215-59628fb20fa4,v0.3.0
Fix Available
0.28.1,v0.0.0-20260325103443-df4378316f3b,v0.28.1,1.44.0-r0,8.19.13-r2,9.2.7-r2,9.3.2-r1,8.19.13-r1,9.2.7-r3,9.3.2-r2,0.67.1-r2,0.67.1-r1,0.32.1-r3,5.1.1-r1,29.5.2-r0,1.1.0-r2,1.25.12-r1,4.0.5-r0,4.0.3-r2,2.16.0-r4,2.3.6-r0,5.4.0-r15,2.18.2-r1,2.18.2-r0,0.69.3-r6,0.69.3-r4,0.30.1-r4,0.30.1-r3,2.1.15-r4

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