CVE-2026-6668
Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 CWE-835 |
| Vendor | n/a |
| Product | pgbouncer |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
n/a / PgBouncer
0 ≤ 1.25.2
Credits
Thanks to @var77 for finding and reporting this issue.