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CVE-2026-107350

Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer

HIGH
8.8
CVSS Score
Published: October 14, 2026 at 05:34 PM UTC
Updated: October 16, 2026 at 03:17 PM UTC
1 product affected across 1 vendorPgbouncer

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHPostgreSQL
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-287

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