HIGHpublic-safe

CVE-2026-89147

NVD: 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. NVD: 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. OSV: Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read

CVSS
8.7 Severity
HIGH EPSS
0.0028 (20) KEV
-

Source-published summary

Possible impact

Source describes service availability risk. Possible impact: The affected service may become unavailable or unreliable.

Affected context

Affected product or version requires source confirmation.

Remediation / advisory

Remediation reference present; patch status requires confirmation in the linked advisory.

Why it matters

Source describes service availability risk. Possible impact: The affected service may become unavailable or unreliable.; CVSS 8.7 (HIGH); EPSS percentile 20; not listed in KEV; Remediation reference present; patch status requires confirmation in the linked advisory; sources: NVD, OSV.

What to verify

Confirm affected product/version, vendor advisory, patch or mitigation, and exposure.

Exposure hint

exposure unknown

Impact tags

service availability review

Urgency reasons

CVSS HIGHvendor advisory presentrecent update

Source-derived note

Summary derived from NVD / OSV description; unsafe procedural detail is not shown.

Redaction metadata

source summary used: True
fallback summary used: False
unsafe procedural detail present: false
raw source displayed: false
public summary redacted: true

Remediation handoff

Public-safe static handoff for human/Codex remediation planning. Scan, patch, external execution, and auto remediation are disabled.

Handoff JSON Handoff Markdown Safe Codex prompt

Safety note

This radar shows source-published defensive context only. Exploit procedures, exploit strings, scanner commands, and auto-remediation are not provided.