moby BuildKit up to 0.33.0 Cleanup path traversal

Summaryinfo

A vulnerability has been found in moby BuildKit up to 0.33.0 and classified as very critical. Affected by this issue is some unknown functionality of the component Cleanup. The manipulation leads to path traversal. This vulnerability is listed as CVE-2026-93315. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in moby BuildKit up to 0.33.0 and classified as very critical. This issue affects an unknown part of the component Cleanup. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-93315 since 09/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 0.33.1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• moby

Name

• BuildKit

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33.0

Website

• Product: https://github.com/moby/buildkit/

CPE 2.3info

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CPE 2.2info

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