# CVE-2026-89147

## Summary

- **CVE ID:** CVE-2026-89147
- **Severity:** HIGH
- **CVSS Score:** 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)
- **CWE:** CWE-1088, CWE-400
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 11, 2026

## 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.

## Affected Products

- net-snmp — Net-SNMP (0)

## References

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

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._