Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing.
History

Fri, 11 Sep 2026 11:00:00 +0000

Type Values Removed Values Added
Description Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing.
Title Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read
First Time appeared Net-snmp
Net-snmp net-snmp
Weaknesses CWE-1088
CWE-400
CPEs cpe:2.3:a:net-snmp:net-snmp:*:*:*:*:*:*:*:*
Vendors & Products Net-snmp
Net-snmp net-snmp
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-11T10:46:56.944Z

Updated: 2026-09-11T10:46:56.944Z

Reserved: 2026-09-11T01:23:34.216Z

Link: CVE-2026-89147

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-11T11:16:58.040

Modified: 2026-09-11T11:16:58.040

Link: CVE-2026-89147

cve-icon Redhat

No data.