BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpath component. As a workaround, avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/moby/buildkit/security/advisories/GHSA-4vrq-3vrq-g6gg Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · mobyprojectNVD modified 2026-10-26 21:10
Affected (CPE criteria) 1
cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:*
References 3
- https://docs.docker.com/build/concepts/context/#url-fragments Product
- https://github.com/moby/buildkit/releases/tag/v0.28.1 Product, Release Notes
- https://github.com/moby/buildkit/security/advisories/GHSA-4vrq-3vrq-g6gg Mitigation, Vendor Advisory