Medium [CVE-2026-121522] In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon
This medium-severity Docker advisory covers CVE-2026-121522 affecting BuildKit.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon. The issue is fixed in v0.34.2.
- through 0.34.1
NVD record · high-confidence parse· fetched 1 day ago·verify at source
Mitigation
Upgrade to a fixed release: 0.34.2. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
NVD record · high-confidence parse· fetched 1 day ago·verify at source
More Docker advisories
- CVE-2026-121520Nov 3, 2026In BuildKit versions prior to v0.34.1, a malicious client with access to the BuildKit
- CVE-2026-93321Oct 5, 2026Docker: malicious frontend can submit an LLB definition that causes buildkitd to panic
- CVE-2026-93315Oct 5, 2026Docker: When proxy networking with CA injection is enabled, a build can modify its CA
- CVE-2026-93326Oct 5, 2026Docker: build step for a Git source, crafted in a specific way, can bypass some policy
- CVE-2026-93323Oct 5, 2026The Dockerfile frontend loaded the Dockerfile and.dockerignore files of a build context
- CVE-2026-93322Oct 5, 2026Docker: malicious frontend can submit an LLB definition that causes buildkitd to panic
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