CVE-2026-93322: CWE-129: Improper Validation of Array Index in moby BuildKit
Description
A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting all builds running on that daemon.
CVSS v4.0
Score 6.9medium
Affected software
moby
BuildKit
pkg:github/github.com/moby/buildkitRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-129) in moby BuildKit affects versions from 0 up to and including 0.33.0. It arises from improper validation of array indices in the processing of LLB definitions submitted by frontends. A maliciously crafted LLB definition can cause the buildkitd daemon to panic and terminate unexpectedly, disrupting all builds managed by that daemon. The CVSS 4.0 base score is 6.9, reflecting a medium severity with local attack vector, low attack complexity, no privileges or user interaction required, and high impact on availability.
Potential Impact
Successful exploitation results in denial of service by causing the buildkitd daemon to crash and terminate, interrupting all ongoing builds on that daemon. There is no indication of code execution, data disclosure, or privilege escalation. The impact is limited to availability disruption of build processes.
Mitigation Recommendations
No official patch or fix is currently available for this vulnerability. Users should monitor the vendor advisory for updates. Until a fix is released, restricting access to the buildkitd daemon to trusted frontends and minimizing exposure to untrusted inputs may reduce risk. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Docker
- Date Reserved
- 2026-09-17T17:18:09.497Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac3e69c2cdf04f65628b478
Added to database: 10/05/2026, 18:04:12 UTC
Last enriched: 10/05/2026, 18:19:13 UTC
Last updated: 10/05/2026, 19:19:10 UTC
Views: 6
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