CVE-2026-6668 — Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input m…
Published: 2026-09-23 · CVSS: 7.5 · CVSS 3.1
Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7