CVE-2021-3935

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 TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.

• CWE-89
• CWE-295

• http://www.pgbouncer.org/changelog.html#pgbouncer-116xRelease Notes, Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2021251Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/02/msg00016.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNPCV3KRDI5PLLLKADFVIOHACQJLZMLI/
• http://www.pgbouncer.org/changelog.html#pgbouncer-116xRelease Notes, Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2021251Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/02/msg00016.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2025/05/msg00032.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNPCV3KRDI5PLLLKADFVIOHACQJLZMLI/

Published

Nov 22, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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