{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.2"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.ongres.scram:scram-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.2"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.ongres.scram:scram-common"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53712"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-636",
      "CWE-757"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T21:51:17Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nA flaw in `com.ongres.scram:scram-client` allows an attacker capable of performing a TLS man-in-the-middle (MITM) attack to silently downgrade a connection from `SCRAM-SHA-256-PLUS` (with channel binding) to standard `SCRAM-SHA-256` (without channel binding), bypassing strict client-side enforcement policies.\n\n## Component Breakdown\n\nThis occurs due to a two-part failure in `TlsServerEndpoint` when a server presents an `X.509` certificate using a modern signature algorithm that lacks traditional `WITH` naming structures (such as `Ed25519` or post-quantum algorithms):\n\n1. The internal hash derivation method fails to parse the algorithm name, swallows the resulting `NoSuchAlgorithmException, and silently returns an empty byte array via the deprecated `getChannelBindingData()` API.\n2. The client builder mistakenly interprets this empty byte array as an environmental absence of channel binding data rather than a cryptographic failure, falling back to non-channel-bound authentication.\n\n## Impact \u0026 Scope\n\nThis issue only impacts deployments where the downstream application layer explicitly enforces strict channel binding enforcement (e.g., channelBinding=require in pgJDBC).\n\nDrivers operating under a \"prefer\" or \"allow\" policy  (used by default) are structurally insulated from an unhandled exception since a fallback to standard SCRAM is within their expected configuration.\n\n## Remediation\n\nUpdate your project configuration to pull in version 3.3 or later of the SCRAM library, which introduces strict exception propagation and explicit policy controls.\n\nIf you are interacting with the `ScramClient` builder API directly (e.g., writing a custom driver or database extension):\n\n- Migrate Deprecated APIs: Stop using `TlsServerEndpoint.getChannelBindingData()`. Transition immediately to `TlsServerEndpoint.getChannelBindingHash()`, which correctly propagates `NoSuchAlgorithmException` up the stack.\n- Adopt Explicit Policies: Leverage the newly introduced `ChannelBindingPolicy` API during client construction. Do not rely on implicit parameter presence to dictate your security boundaries.\n\n```java\nScramClient client = ScramClient.builder()\n    .advertisedMechanisms(serverMechanisms)\n    .username(user)\n    .password(pass)\n    // Explicitly enforce strict boundaries if needed.\n    .channelBindingPolicy(ChannelBindingPolicy.REQUIRE) \n    .channelBinding(TlsServerEndpoint.TLS_SERVER_END_POINT, certHash)\n    .build();\n```",
  "id": "GHSA-p9jg-fcr6-3mhf",
  "modified": "2026-07-01T21:51:17Z",
  "published": "2026-07-01T21:51:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ongres/scram/security/advisories/GHSA-p9jg-fcr6-3mhf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ongres/scram"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OnGres SCRAM silent channel-binding authentication downgrade via unsupported certificate algorithms"
}