Arbitrary Argument Injection Affecting github.com/moby/buildkit/source/git package, versions >=0.30.0 <0.31.2
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.
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- published23 Jul 2026
- disclosed21 Jul 2026
- creditssst0n3
Introduced: 21 Jul 2026
CVE-2026-15793 (opens in a new tab)How to fix?
Upgrade github.com/moby/buildkit/source/git to version 0.31.2 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary Argument Injection through gitSourceHandler.checkoutAsBundle in source/git/bundle.go and getDefaultBranch in source/git/source.go. An attacker can trigger crafted host-side git command arguments by supplying a malicious Git repository whose advertised default branch or bundle ref begins with dash-like option text. When git.checkoutbundle=true is used against an attacker-controlled Git source, the code reuses the remote’s advertised ref and passes it to git fetch without protecting it as a positional argument. That lets the attacker influence the git invocation on the build host, breaking the checkout process and enabling execution of unintended Git options during source retrieval.