CVE-2026-89147 Net-SNMP - Denial of Service

Net-SNMP through 5.9.5.2 contains a denial of service caused by unauthenticated blocking read without timeout in the SMUX module's smux_accept(), letting unauthenticated remote clients block SNMP processing indefinitely, exploit requires network access to SMUX listener.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.49% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to the latest version beyond 5.9.5.2.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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