CVE-2026-107350

Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer

En bref

Sévérité: HIGH 8.8
EPSS: EPSS 0.37 % · centile 31 (2026-10-28)
État: PUBLISHED
Publiée: 2026-10-14
Mise à jour: 2026-10-16
Attribuée par: PostgreSQL
Statut NVD: Awaiting Analysis

Description

Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user listed in auth_file to log in as any other user that authenticates using SCRAM, including PgBouncer admin users and backend superusers. A second StartupMessage sent during SCRAM authentication against a non-existent database is not rejected and switches the user being logged in as, while the SCRAM exchange is still verified against the keys of the first user.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	PostgreSQL
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 (Secondary)

Faiblesses (CWE)

CWE-287

Références européennes

ENISA EUVD · EUVD-2026-101500
GCVE · GCVE-0-2026-107350

Produits affectés

Produit	Versions
PgBouncer	affected 1.17.0 < 1.26.1

Références

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD