CVE-2026-107350
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductPgBouncer
PublishedOct 14, 2026
First seenOct 14, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- PgBouncer1.26.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| PgBouncer | 1.17.0 ≤ v < 1.26.1 | 1.26.1 |
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