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CVE-2026-89147— Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read

Quick assessment

Affected
net-snmp Net-SNMP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Net-SNMP 版本 5.9.5.2 及之前版本存在一个拒绝服务（DoS）漏洞，位于 SMUX 模块中。该漏洞源于 函数对新建连接执行无超时的未认证阻塞式读取操作。未经身份验证的远程客户端可以连接到 SMUX 监听器但不发送任何数据，导致单线程的 主循环无限期阻塞，从而挂起所有的 SNMP 处理。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
net-snmp Net-SNMP ≤ 5.9.5.2 affected
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I. Basic Information for CVE-2026-89147

Vulnerability Information
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Vulnerability Title
Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
远程资源无超时同步访问
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
net-snmp Net-SNMP 0 ~ 5.9.5.2 -

II. Public POCs for CVE-2026-89147

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III. Intelligence Information for CVE-2026-89147

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Vendor Advisories for CVE-2026-89147 (1)

Other References for CVE-2026-89147 (2)

IV. Related Vulnerabilities

Same product: Net-SNMP
Same vendor: net-snmp
Same weakness: CWE-1088

V. Comments for CVE-2026-89147

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