GHSA-4c29-8rgm-jvjj
BuildKit's Malicious frontend can cause file escape outside of storage root
At a glance
- Published
- Updated
- CVE
- CVE-2026-33747
- Aliases
- GO-2026-4858
- CVSS_V3
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Description
### Impact When using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. ### Patches The issue has been fixed in v0.28.1+ ### Workarounds Issue requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.
Affected packages
| Package | Versions |
|---|---|
| Go · github.com/moby/buildkit | introduced 0, fixed 0.28.1 |
References
- https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33747 ADVISORY
- https://github.com/moby/buildkit PACKAGE
- https://github.com/moby/buildkit/releases/tag/v0.28.1 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |