CVE-2026-93321

Malformed LLB file operation can crash buildkitd

Published Oct 5, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
A malicious frontend can submit an LLB definition that causes buildkitd
to panic and terminate, interrupting all builds running on that daemon.

Remediation

Vendor Workaround

Avoid using external BuildKit frontends from untrusted sources. Dockerfile builds are unaffected.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Moby
Moby buildkit
Vendors & Products Moby
Moby buildkit
Type Values Removed Values Added
Description A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting all builds running on that daemon.
Title Malformed LLB file operation can crash buildkitd
Weaknesses CWE-129
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Docker
Published
Updated
Oct 6, 2026, 1:25 PM
Reserved
Sep 17, 2026, 5:18 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 10:16 PM
Modified
Oct 6, 2026, 3:08 PM