Denial of Service Vulnerability in Net-SNMP Product by Net-SNMP
CVE-2026-89147

8.7HIGH

Key Information:

Vendor

Net-snmp

Status
Net-snmp
Vendor
CVE Published:
11 September 2026

What is CVE-2026-89147?

The vulnerability in the Net-SNMP product arises within the SMUX module, where the function smux_accept() allows unauthenticated remote clients to connect and induce a denial of service condition. This occurs due to an indefinite blocking read on newly accepted connections lacking a timeout feature. As a result, the main processing loop of the single-threaded snmpd becomes suspended, halting all SNMP processing and potentially affecting network monitoring and management operations.

Affected Version(s)

Net-SNMP 0 <= 5.9.5.2

References

https://gist.github.com/thesmartshadow/001cea595e75fed6aa...
third-party-advisory
https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/...
technical-description
https://github.com/net-snmp/net-snmp
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ali Firas
.