BuildKit: Malicious client can bypass destination directory validation on local sources upload

Description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.2, a custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access BuildKit control API to issue builds, eg., bypass authentication, etc. This issue is fixed in version 0.31.2.

Scores

EPSS (exploitation in 30 days)

0.54% · top 54% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Weakness

• CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (opens in a new tab)All about CWE-22 and its CVEs

Affected products

• moby · buildkit

  • affected < 0.31.2

References (2)

• https://github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976 (opens in a new tab)x_refsource_CONFIRM
• https://github.com/moby/buildkit/releases/tag/v0.31.2 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-75593](https://trackcve.app/badge/CVE-2026-75593.svg)](https://trackcve.app/cve/CVE-2026-75593)

Record last updated 25 Aug 2026, 14:02 UTC.