CVE-2026-107349
Infinite loop on empty option name in startup options parameter in PgBouncer
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-835 CWE-400 |
| Vendor | n/a |
| Product | pgbouncer |
| Published | Oct 14, 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
1.20.0 < 1.26.1
Credits
Thanks to Jackds Security (@jackds-security) for finding and reporting this issue.