Public mode

No access to your tenant or devices. Every item links to its source. What this means

CVE-2026-89147

Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read

CVSS 3.1 7.5 HIGHCVSS 4.0 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-89147

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-89147

Published

Net-SNMP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "vendor": "net-snmp",
                    "product": "Net-SNMP",
                    "packageURL": "pkg:github/net-snmp/net-snmp",
                    "repo": "https://github.com/net-snmp/net-snmp",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "5.9.5.2",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON