Symlink Attack Affecting github.com/moby/buildkit/client/llb package, versions <0.28.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMOBYBUILDKITCLIENTLLB-15790742
- published27 Mar 2026
- disclosed26 Mar 2026
- creditUnknown
Introduced: 26 Mar 2026
CVE-2026-33748 Â (opens in a new tab)How to fix?
Upgrade github.com/moby/buildkit/client/llb to version 0.28.1 or higher.
Overview
Affected versions of this package are vulnerable to Symlink Attack when processing Git URL fragment subdir components. An attacker can access files outside the intended Git repository root by specifying a crafted subdir value in the URL fragment.
Note:
This is only exploitable if builds use Git URLs with a subpath component and the subdir points to a symlink in an untrusted repository.
Workaround
This vulnerability can be mitigated by avoiding builds from untrusted sources or not using the subdir component from untrusted Git repositories.