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Fencer Intel
high 7.5

CVE-2026-107349 json

Infinite loop on empty option name in startup options parameter in PgBouncer

published 26d ago modified 19d ago also BIT-pgbouncer-2026-107349 , EUVD-2026-101499

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami pgbouncer 1.26.1
  • n/a PgBouncer 1.26.1
  • pgbouncer Debian 14 1.26.1-1

debian advisories DEBIAN-CVE-2026-107349

  • pgbouncer hummingbird 1 1.26.1-1.hum1

red hat advisories RHSA-2026:83843

  • pgbouncer Azure Linux 3.0 1.26.1-1

azure linux advisories AZL-108192

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-107349 updated cvss 7.5

pgbouncer: pgbouncer: Denial of Service via empty parameter name in startup options

  • Red Hat Hardened Images pgbouncer 1.26.1-1.hum1
    fixed: vendor fix RHSA-2026:83843

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
24d ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami pgbouncer
>=1.20.0, <1.26.1
1.26.1

Affected products

  • n/a PgBouncer

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.