CVE-2026-93322
Received Received - Intake

Buildkitd Panic via Malicious LLB Definition

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: Docker Inc.

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

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-05
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-93322
EUVD
EUVD-2026-92542

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
moby BuildKit 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-129 The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.

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Executive Summary

This vulnerability allows a malicious frontend to submit a specially crafted LLB definition to BuildKit, causing the buildkitd daemon to crash and terminate. This interrupts all builds running on that daemon, resulting in a denial of service.

Detection Guidance

To detect this vulnerability, check the BuildKit version running on your system. Run: docker buildx version. If the version is v0.33.0 or earlier, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability can disrupt all ongoing builds on the affected BuildKit daemon, leading to downtime and loss of productivity. It does not affect confidentiality or integrity of data.

Compliance Impact

This vulnerability primarily causes service disruption but does not directly impact data confidentiality or integrity. Compliance impact would depend on downtime severity and organizational policies, but no specific regulatory violations are mentioned.

Mitigation Strategies

Immediately update BuildKit to version v0.33.1 or later. Avoid using untrusted external BuildKit frontends until the update is applied.

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