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CVE-2026-107350

Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
n/a / PgBounceraffected 1.17.0 before 1.26.1

CWE

CWE-287

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.