CVE-2026-15791

High

Description

A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.

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-32pv-7hq5-qhwq

Affected products

Product	Affected versions	Fixed in
mobyproject buildkit	v < 0.31.2	0.31.2

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.