CVE-2026-89147CWE-1088CWE-400denial-of-service

CVE-2026-89147

High · published September 11, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
40.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · 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
EPSS
0.00486 · 40.9th percentile
Weaknesses
CWE-1088 · Synchronous Access of Remote Resource without Timeout; CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-11T15:16Z
References (5)
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]https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 10:46Z
    Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read
    cvelistv5