CVE WatchSep 23, 2026

CVE-2026-6668

Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial o

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

0-100

Published: Sep 23, 2026 · Last modified: Sep 23, 2026 · CWE-190 · CWE-835

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

www.pgbouncer.orghttps://www.pgbouncer.org/changelog.html

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