SCRAM: Silent channel-binding authentication downgrade via unsupported certificate algorithms

{
  "id": "e35ddc6318df9f9d68f34a05635dc41bd869c07a8a320c2f725b6d7d0c8e6480",
  "url": "https://osv.dev/vulnerability/CVE-2026-53712",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SCRAM: Silent channel-binding authentication downgrade via unsupported certificate algorithms",
    "summary": "SCRAM (Salted Challenge Response Authentication Mechanism) is part of the family of Simple Authentication and Security Layer (SASL, RFC 4422) authentication mechanisms. Prior to 3.3, a flaw in com.ongres.scram:scram-client and com.ongres.scram:scram-common allows an attacker capable of a TLS man-in-the-middle attack to silently downgrade a connection from SCRAM-SHA-256-PLUS with channel binding to standard SCRAM-SHA-256 without channel binding when TlsServerEndpoint processes an X.509 certificate using a modern signature algorithm such as Ed25519; getChannelBindingData() can return an empty byte array after NoSuchAlgorithmException, and the ScramClient builder treats that as absent channel-binding data. This issue is fixed in version 3.3.",
    "evidence": "osv:CVE-2026-53712",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53712",
      "aliases": [
        "CVE-2026-53712",
        "GHSA-p9jg-fcr6-3mhf"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ongres/scram",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f6bd6e20e34d4989ee34b06825791657a2cfd4fe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f6bd6e20e34d4989ee34b06825791657a2cfd4fe"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.3"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.2",
            "3.1",
            "3.0",
            "2.1",
            "2.0",
            "2.0-beta3",
            "2.0-beta2",
            "2.0-beta1",
            "1.9-beta1",
            "1.0.0-beta.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53712.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.535476340Z",
      "provider": "osv",
      "references": [
        "https://github.com/ongres/scram/releases/tag/3.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53712.json",
        "https://github.com/ongres/scram/security/advisories/GHSA-p9jg-fcr6-3mhf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53712"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-636",
          "CWE-757"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53712.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53712",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517059,
  "published_at": "2026-07-17T18:19:11.896+00:00"
}