Vulnerabilities in pkg:maven/com.ongres.scram/scram-client

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p9jg-fcr6-3mhf",
  "modified" : "2026-07-01T21:51:17Z",
  "published" : "2026-07-01T21:51:17Z",
  "aliases" : [ "CVE-2026-53712" ],
  "summary" : "OnGres SCRAM silent channel-binding authentication downgrade via unsupported certificate algorithms",
  "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 & 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```",
  "severity" : [ {
    "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" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.ongres.scram:scram-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.2"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.ongres.scram:scram-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ongres/scram/security/advisories/GHSA-p9jg-fcr6-3mhf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ongres/scram"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-636", "CWE-757" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T21:51:17Z",
    "nvd_published_at" : null
  }
}