CVE-2026-93321

Malformed LLB file operation can crash buildkitd

State: Published
Severity: 6.9 Medium
Published: Oct 5, 2026
Updated: Oct 6, 2026
Reserved: Sep 17, 2026

Description

A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting all builds running on that daemon.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	Docker

Weaknesses

CWE-129 Improper Validation of Array Index

Affected Products

Product	Versions
BuildKitmoby	0.33.0 and earlierAffected

References

https://github.com/moby/buildkit/security/advisories/GHSA-fjj4-h6vf-m9hjvendor-advisory
https://github.com/moby/buildkit/releases/tag/v0.33.1patch

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