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CVE-2024-23651: BuildKit possible race condition with accessing subpaths from cache mounts

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-31 · updated 2026-06-17
• Weakness: CWE-362

Description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Two malicious build steps running in parallel sharing the same cache mounts with subpaths could cause a race condition that can lead to files from the host system being accessible to the build container. The issue has been fixed in v0.12.5. Workarounds include, avoiding using BuildKit frontend from an untrusted source or building an untrusted Dockerfile containing cache mounts with --mount=type=cache,source=... options.

Affected products

• moby BuildKit: before 0.12.5 — fixed in 0.12.5

How to fix

Upgrade to a fixed version: moby BuildKit 0.12.5. Check the vendor advisory for mitigations.

References

• https://github.com/moby/buildkit/pull/4604
• https://github.com/moby/buildkit/releases/tag/v0.12.5
• https://github.com/moby/buildkit/security/advisories/GHSA-m3r6-h7wv-7xxv
• https://github.com/moby/buildkit/pull/4604
• https://github.com/moby/buildkit/releases/tag/v0.12.5
• https://github.com/moby/buildkit/security/advisories/GHSA-m3r6-h7wv-7xxv

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