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Back to active CVEs
High · CVSS 8.7CVE-2026-89147

Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX ReadCVE-2026-89147

Answer in brief

CVE-2026-89147 records a High severity (CVSS 8.7) vulnerability in Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read. The current sources do not mark it as known exploited. The current feed maps net-snmp/Net-SNMP (generic), net-snmp/Net-SNMP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 24, 2026Source checked Oct 26, 2026First seen by HOL Sep 11, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps net-snmp/Net-SNMP (generic), net-snmp/Net-SNMP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
net-snmp/Net-SNMPgeneric0Not reported
net-snmp/Net-SNMPgeneric>=0 <=5.9.5.2Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for net-snmp/Net-SNMP, net-snmp/Net-SNMP.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 11, 2026

Sources and claim methodology

  • GitHub security advisorygist.github.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunksAlso CWE-400
  • Resource Exhaustion in MICE ServiceAlso CWE-400

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-1088, CWE-400
Source
CVE List V5
Source checked
Oct 26, 2026
References
4 linked sources
Open source record