Vulnerability in PgBouncer

[ Description ]Official description

An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denial of service. A StartupMessage whose options parameter contains an empty parameter name, such as "-c=", makes the ignore_startup_parameters list lookup loop forever. Because PgBouncer serves all clients from a single process, this saturates a CPU core and makes PgBouncer unresponsive to all clients until the process is restarted.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3906

  PgBouncer: Multiple vulnerabilities Translated from German

  CVE-2026-107348CVE-2026-107349CVE-2026-107350

[ References ]References

• www.pgbouncer.org/changelog.html