GHSA-4vrq-3vrq-g6gg
BuildKit Git URL subdir component can cause access to restricted files
At a glance
- Published
- Updated
- CVE
- CVE-2026-33748
- Aliases
- GO-2026-4859
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Description
### Impact Insufficient validation of Git URL fragment subdir components (`<url>#<ref>:<subdir>`, [docs](https://docs.docker.com/build/concepts/context/#url-fragments)) may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. ### Patches The issue has been fixed in version v0.28.1 ### Workarounds The issue affects only builds that use Git URLs with a subpath component. 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.
Affected packages
| Package | Versions |
|---|---|
| Go · github.com/moby/buildkit | introduced 0, fixed 0.28.1 |
References
- https://github.com/moby/buildkit/security/advisories/GHSA-4vrq-3vrq-g6gg WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33748 ADVISORY
- https://docs.docker.com/build/concepts/context/#url-fragments WEB
- 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 |