CVE-2026-75593 BuildKit: Malicious client can bypass destination directory validation on local sources upload
A malicious client with API access can bypass directory validation to read or modify files outside the intended build context in BuildKit.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-75593?
CVE-2026-75593 is a high-severity path traversal vulnerability in moby buildkit, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-75593?
How do I fix CVE-2026-75593?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-75593 being exploited?
There is no known exploitation of CVE-2026-75593 in the wild and no public exploit code.
Sources
Also known as AZL-97035, GHSA-wqjv-cjqw-p7p5.