Vulnerability-Lookup

CVE-2026-19888 (GCVE-0-2026-19888)

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

Title

NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer

Summary

Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 16:33 UTC

CWE

CWE-476 - NULL Pointer Dereference

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 @mble for finding and reporting this issue. Independently reported by @thesecguy45. Independently reported by @umutbasal. Independently reported by @jackds-security. Independently reported by @palak-paneer. Independently reported by @shakirov-vm.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-19888

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

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/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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GHSA-W79M-39MQ-X36C

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

Details

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

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  "affected": [],
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    "CVE-2026-19888"
  ],
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    "github_reviewed_at": null,
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  },
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  "id": "GHSA-w79m-39mq-x36c",
  "modified": "2026-09-23T18:31:56Z",
  "published": "2026-09-23T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19888"
    },
    {
      "type": "WEB",
      "url": "https://www.pgbouncer.org/changelog.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-19888

Vulnerability from csaf_microsoft - Published: 2026-09-25 01:01 - Updated: 2026-09-25 01:01

Summary

NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer

Scope

1 vulnerability in this advisory, including CVE-2026-19888.

CVE-2026-19888

7.5 (High)


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

Known affected: 1 product

Open the full advisory

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-2026-19888.

CVE-2026-19888

A flaw was found in PgBouncer. Missing validation of a mandatory attribute in the SCRAM client-final-message parser allows an unauthenticated remote attacker to crash the process. By sending a malformed message, the parser can report success while a required value remains unset, leading to a NULL pointer dereference. This crash occurs before any credentials are verified and terminates all pooled connections, resulting in a Denial of Service.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/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-2026-19888 (CVE-2026-19888)

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

Details

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-19888	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-19888	REPORT
	https://www.pgbouncer.org/changelog.html	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.7-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.7-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.5-1",
        "1.6.1-1",
        "1.7-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.8.1-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.8.1-1build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.2-3build1",
        "1.7.2-65-g2b8e6cf-1",
        "1.8.1-1",
        "1.8.1-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.12.0-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.12.0-3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.0-1",
        "1.10.0-1build1",
        "1.11.0-1",
        "1.12.0-2",
        "1.12.0-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.16.1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.16.1-1ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.15.0-1",
        "1.16.1-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.22.0-1build4"
          }
        ]
      },
      "package": {
        "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 validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.",
  "id": "UBUNTU-CVE-2026-19888",
  "modified": "2026-09-24T00:00:00Z",
  "published": "2026-09-24T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19888"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-19888"
    },
    {
      "type": "REPORT",
      "url": "https://www.pgbouncer.org/changelog.html"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-19888"
  ]
}

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-2026-19888 (GCVE-0-2026-19888)

FKIE_CVE-2026-19888

GHSA-W79M-39MQ-X36C

MSRC_CVE-2026-19888

RHSA-2026:70698

UBUNTU-CVE-2026-19888 (CVE-2026-19888)

Tags

Sightings

Nomenclature

Related by attack behaviour