PostgreSQL PgBouncer up to 1.26.0 SCRAM Authentication improper authentication

Summaryinfo

A vulnerability, which was classified as very critical, was found in PostgreSQL PgBouncer up to 1.26.0. This affects an unknown part of the component SCRAM Authentication. Executing a manipulation can lead to improper authentication. This vulnerability appears as CVE-2026-107350. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in PostgreSQL PgBouncer up to 1.26.0 and classified as very critical. This vulnerability affects some unknown functionality of the component SCRAM Authentication. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at pgbouncer.org. This vulnerability was named CVE-2026-107350 since 10/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/14/2026).

Upgrading to version 1.26.1 eliminates this vulnerability.

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Productinfo

Type

• Database Software

Vendor

• PostgreSQL

Name

• PgBouncer

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26.0

License

• open-source

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CPE 2.2info

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