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VULNERABILITIES

CVE-2026-89147 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb CISA-ADP
https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb [email protected]
https://github.com/net-snmp/net-snmp [email protected]
https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.c [email protected]
https://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1088Synchronous Access of Remote Resource without Timeout[email protected]
CWE-400Uncontrolled Resource Consumption[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-89147
NVD Published Date:
Sep 11, 2026
NVD Last Modified:
Sep 24, 2026
Source:
[email protected]
CVE-2026-89147 Details - Not Deferred