Vulnerability-Lookup

CVE-2026-53712 (GCVE-0-2026-53712)

Vulnerability from cvelistv5 – Published: 2026-07-17 18:19 – Updated: 2026-07-17 19:09

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.

Severity

8.2 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 19:08 UTC

CWE

CWE-636 - Not Failing Securely ('Failing Open')
CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/ongres/scram/security/advisori…	x_refsource_CONFIRM
https://github.com/ongres/scram/releases/tag/3.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
ongres	scram	Affected: < 3.3	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-53712

Vulnerability from fkie_nvd - Published: 2026-07-17 19:17 - Updated: 2026-07-23 16:15

Severity

8.2 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/ongres/scram/releases/tag/3.3
	security-advisories@github.com	https://github.com/ongres/scram/security/advisories/GHSA-p9jg-fcr6-3mhf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-P9JG-FCR6-3MHF

Vulnerability from github – Published: 2026-07-01 21:51 – Updated: 2026-07-01 21:51

Summary

OnGres SCRAM silent channel-binding authentication downgrade via unsupported certificate algorithms

Details

Summary

A 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.

Component Breakdown

This 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):

The internal hash derivation method fails to parse the algorithm name, swallows the resulting NoSuchAlgorithmException, and silently returns an empty byte array via the deprecatedgetChannelBindingData()` API.
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.

Impact & Scope

This issue only impacts deployments where the downstream application layer explicitly enforces strict channel binding enforcement (e.g., channelBinding=require in pgJDBC).

Drivers 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.

Remediation

Update your project configuration to pull in version 3.3 or later of the SCRAM library, which introduces strict exception propagation and explicit policy controls.

If you are interacting with the ScramClient builder API directly (e.g., writing a custom driver or database extension):

Migrate Deprecated APIs: Stop using TlsServerEndpoint.getChannelBindingData(). Transition immediately to TlsServerEndpoint.getChannelBindingHash(), which correctly propagates NoSuchAlgorithmException up the stack.
Adopt Explicit Policies: Leverage the newly introduced ChannelBindingPolicy API during client construction. Do not rely on implicit parameter presence to dictate your security boundaries.

ScramClient client = ScramClient.builder()
    .advertisedMechanisms(serverMechanisms)
    .username(user)
    .password(pass)
    // Explicitly enforce strict boundaries if needed.
    .channelBindingPolicy(ChannelBindingPolicy.REQUIRE) 
    .channelBinding(TlsServerEndpoint.TLS_SERVER_END_POINT, certHash)
    .build();

Severity

8.2 (High)


                  
                    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

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{
  "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"
}

RHSA-2026:51653

Vulnerability from csaf_redhat - Published: 2026-08-13 14:50 - Updated: 2026-10-16 11:08

Summary

Red Hat Security Advisory: Red Hat build of Quarkus 3.33.3 release and security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-53712.

CVE-2026-53712

A flaw was found in the SCRAM (Salted Challenge Response Authentication Mechanism) client and common libraries. An attacker performing a man-in-the-middle (MITM) attack on a Transport Layer Security (TLS) connection can silently downgrade the authentication process. This vulnerability allows the attacker to bypass the stronger SCRAM-SHA-256-PLUS authentication with channel binding, forcing a weaker SCRAM-SHA-256 authentication without channel binding, which could compromise the integrity of the authentication.

5.9 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:51653

Open the full advisory

RHSA-2026:53643

Vulnerability from csaf_redhat - Published: 2026-08-13 14:51 - Updated: 2026-10-16 11:08

Summary

Red Hat Security Advisory: Red Hat build of Quarkus 3.27.5 release and security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-53712.

CVE-2026-53712

5.9 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:53643

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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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.

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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.
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Action not permitted

CVE-2026-53712 (GCVE-0-2026-53712)

FKIE_CVE-2026-53712

GHSA-P9JG-FCR6-3MHF

Summary

Component Breakdown

Impact & Scope

Remediation

RHSA-2026:51653

RHSA-2026:53643

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