CVE-2026-93321 PUBLISHED

Malformed LLB file operation can crash buildkitd

Assigner: Docker
Reserved: 17.09.2026 Published: 05.10.2026 Updated: 06.10.2026

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

CVSS 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Vendor	moby
Product	BuildKit
Versions	Default: unaffected affected from 0 to 0.33.0 (incl.)

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