High severity · published Oct 14, 2026
CVE-2026-107349
Infinite loop on empty option name in startup options parameter in PgBouncer
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PG
PgBouncer ·
1.20.0 before 1.26.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107349
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107349
www.pgbouncer.org
https://www.pgbouncer.org/changelog.html
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