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7.5 High

CVE-2026-6668 Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker…

Description

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.

Affected products and versions

Product Affected versions Fixed in
pgbouncer 1.25 earliest → 1.25.2 No fix stated

References

Timeline

  1. Published
  2. Last modified

Other CVEs of pgbouncer

The 13 CVEs of pgbouncer →
CVE-2026-107350 Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user… 8.8 High CVE-2026-107349 An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denial of… 7.5 High CVE-2026-107348 Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows a… 5.9 Medium CVE-2026-19888 Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2… 7.5 High
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