Vulnerability-Lookup

CVE-2026-6669 (GCVE-0-2026-6669)

Vulnerability from cvelistv5 – Published: 2026-09-23 16:04 – Updated: 2026-09-23 16:46

Title

Unbounded SCRAM iteration count causes CPU exhaustion in PgBouncer

Summary

Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in this way stop it from serving traffic for every other database and client it is pooling, so the failure of a single backend is not contained.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 16:33 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

PostgreSQL redhat root

References

1 reference

URL	Tags
https://www.pgbouncer.org/changelog.html

Impacted products

1 product

Vendor	Product	Version	CPE status
n/a	PgBouncer	Affected: 0 , ≤ 1.25.2 (semver)

Credits

Thanks to @HarutoKimura for finding and reporting this issue.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-6669

Vulnerability from fkie_nvd - Published: 2026-09-23 17:17 - Updated: 2026-09-23 19:40

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	f86ef6dc-4d3a-42ad-8f28-e6d5547a5007	https://www.pgbouncer.org/changelog.html

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "PgBouncer",
          "vendor": "n/a",
          "versions": [
            {
              "lessThanOrEqual": "1.25.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
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        }
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    }
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  "id": "CVE-2026-6669",
  "lastModified": "2026-09-23T19:40:10.000",
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GHSA-58J7-V2VX-R29W

Vulnerability from github – Published: 2026-09-23 18:31 – Updated: 2026-09-23 18:31

Details

Severity

5.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-6669"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-23T17:17:16Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-58j7-v2vx-r29w",
  "modified": "2026-09-23T18:31:56Z",
  "published": "2026-09-23T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6669"
    },
    {
      "type": "WEB",
      "url": "https://www.pgbouncer.org/changelog.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:70698

Vulnerability from csaf_redhat - Published: 2026-09-23 10:57 - Updated: 2026-09-24 17:29

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-6669.

CVE-2026-6669

A flaw was found in PgBouncer. A malicious or compromised PostgreSQL backend can exploit a missing upper bound on the key derivation iteration count during SCRAM (Salted Challenge Response Authentication Mechanism) authentication. This can lead to uncontrolled CPU consumption in PgBouncer, effectively stopping it from serving traffic for all other databases and clients it manages. This results in a Denial of Service (DoS) for all connected services.

5.9 (Medium)


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

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:70698

Open the full advisory

UBUNTU-CVE-2026-6669 (CVE-2026-6669)

Vulnerability from osv_ubuntu – Published: 2026-09-24 00:00 – Updated: 2026-09-24 00:00 – Source website

Details

Severity

5.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-6669	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-6669	REPORT
	https://www.pgbouncer.org/changelog.html	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.7-1"
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      },
      "ranges": [
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          ],
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          {
            "binary_name": "pgbouncer",
            "binary_version": "1.8.1-1build1"
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      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.8.1-1build1?arch=source\u0026distro=bionic"
      },
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          ],
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      ],
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      ]
    },
    {
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            "binary_version": "1.12.0-3"
          }
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      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.12.0-3?arch=source\u0026distro=focal"
      },
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        "1.11.0-1",
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    },
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      "package": {
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        "purl": "pkg:deb/ubuntu/pgbouncer@1.16.1-1ubuntu1?arch=source\u0026distro=jammy"
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        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.22.0-1build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.20.0-1",
        "1.21.0-1",
        "1.22.0-1",
        "1.22.0-1build1",
        "1.22.0-1build3",
        "1.22.0-1build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.25.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.25.1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.24.1-1",
        "1.25.0-2",
        "1.25.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in this way stop it from serving traffic for every other database and client it is pooling, so the failure of a single backend is not contained.",
  "id": "UBUNTU-CVE-2026-6669",
  "modified": "2026-09-24T00:00:00Z",
  "published": "2026-09-24T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6669"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6669"
    },
    {
      "type": "REPORT",
      "url": "https://www.pgbouncer.org/changelog.html"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6669"
  ]
}

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-6669 (GCVE-0-2026-6669)

FKIE_CVE-2026-6669

GHSA-58J7-V2VX-R29W

RHSA-2026:70698

UBUNTU-CVE-2026-6669 (CVE-2026-6669)

Tags

Sightings

Nomenclature

Related by attack behaviour