High severity7.5NVD Advisory· Published Sep 11, 2026· Updated Sep 24, 2026

CVE-2026-89147

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Net SNMP/Net SNMPreferences2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: <=5.9.5.2

Patches

Vulnerability mechanics

References

gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9ebnvd
github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.cnvd
www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-readnvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000