malcontent OCI image pull credential exfiltration via malicious registry token realm

Open Source Vulnerabilities GO-2026-4392

malcontent OCI image pull credential exfiltration via malicious registry token realm in github.com/chainguard-dev/malcontent

Open Source Vulnerabilities GHSA-9m43-p3cx-w8j5

Malcontent could be made to expose Docker registry credentials if it scanned a specially crafted OCI image reference. Malcontent uses [google/go-containerregistry](https://github.com/google/go-containerregistry) for OCI image pulls, which by default uses the Docker credential keychain. A malicious registry could return a `WWW-Authenticate` header redirecting token authentication to an attacker-controlled endpoint, causing credentials to be sent to that endpoint. **Fix:** [Default to anonymous auth for OCI pulls](https://github.com/chainguard-dev/malcontent/commit/538ed00cdc639d687a4bd1e843a2be0428a3b3e7) **Acknowledgements** Thank you to Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.

Open Source Vulnerabilities CVE-2026-24845

malcontent discovers supply-chain compromises through. context, differential analysis, and YARA. Starting in version 0.10.0 and prior to version 1.20.3, malcontent could be made to expose Docker registry credentials if it scanned a specially crafted OCI image reference. malcontent uses google/go-containerregistry for OCI image pulls, which by default uses the Docker credential keychain. A malicious registry could return a `WWW-Authenticate` header redirecting token authentication to an attacker-controlled endpoint, causing credentials to be sent to that endpoint. Version 1.20.3 fixes the issue by defaulting to anonymous auth for OCI pulls.