High [CVE-2026-33748] BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner
This high-severity Docker advisory covers CVE-2026-33748; related products: BuildKit.
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Summary
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.
- before 0.28.1
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
- 0.28.1
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
Mitigation
Upgrade to a fixed release: 0.28.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
Discussion(0)
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