CVE-2026-15789

High

Description

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 the BuildKit control API to issue builds, e.g., bypass authentication, etc.

SeverityHigh

CVSS7.5

Exploit probability—

ProductMobyproject Buildkit

PublishedJul 21, 2026

First seenJul 21, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

mobyproject buildkit0.31.2 or later

Vendor advisories

github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976

Affected products

Product	Affected versions	Fixed in
mobyproject buildkit	v < 0.31.2	0.31.2

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