PgBouncer Project maintains a lightweight connection-pooling middleware for PostgreSQL that sits between applications and database servers, reducing connection overhead in high-concurrency environments. Its vulnerability exposure has centered on memory-safety issues, particularly improper restriction of operations within memory buffer bounds, reflecting the parsing and state-management demands of a C-based pooling proxy. Current severity, exploitation activity, and exposure counts are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Pgbouncer Project over time
Signals from CVEs in this vendor scope (11 CVEs).
11 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2026-6665CRITICAL The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend th | May 9, 2026 | 9.8 | 41 | NO | NO |
CVE-2026-6664HIGH An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to a crash. An unauthenticated remote attacker can crash PgBoun | May 9, 2026 | 7.5 | 35 | NO | NO |
CVE-2026-6666HIGH A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field. | May 9, 2026 | 7.5 | 32 | NO | NO |
CVE-2025-2291CRITICAL Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value, which allows an attacker to log in with an already expired p | Apr 16, 2025 | 9.8 | 30 | NO | NO |
CVE-2025-12819HIGH Untrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated attacker to execute arbitrary SQL during authentication via a malicious | Dec 3, 2025 | 8.1 | 29 | NO | NO |
CVE-2021-3935HIGH When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of | Nov 22, 2021 | 8.1 | 27 | NO | NO |
CVE-2026-6667MEDIUM PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILL_CLIENT admin command. All users with access to the administration console (which itself requ | May 9, 2026 | 4.3 | 25 | NO | NO |
CVE-2015-4054HIGH PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet. | May 23, 2017 | 7.5 | 24 | NO | NO |
CVE-2021-3672MEDIUM A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might pot | Nov 23, 2021 | 5.6 | 22 | NO | NO |
CVE-2015-6817HIGH PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user via an unknown username. | May 23, 2017 | 8.1 | 21 | NO | NO |
Signals from CVEs in this vendor scope (11 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Pgbouncer Project.
Media articles that mention a CVE ID that affects a product developed by Pgbouncer Project — matched by CVE ID, not by vendor name.