CVE-2026-89147
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductNet-SNMP
PublishedSep 11, 2026
First seenSep 11, 2026
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| net-snmp Net-SNMP | v ≤ 5.9.5.2 | — |
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