CVE-2026-89147

    Dashboard / Vulnerabilities / CVE-2026-89147

    CVE-2026-89147

    Published: 11 Sept 2026Last Modified: 12 Sept 2026

    Summary: Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read

    Details: 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.

    References: https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89147.json, https://github.com/net-snmp/net-snmp, https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.c, https://nvd.nist.gov/vuln/detail/CVE-2026-89147, https://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v5.9.5.2
    v5.9.5.1
    v5.9.5
    v5.9.4
    v5.9.4.rc1
    v5.9.4.pre3
    v5.9.4.pre2
    v5.9.2
    v5.9.2.rc2
    v5.9.2.rc1
    v5.9.2.pre1
    v5.9.1
    v5.9.1.rc1
    v5.9.1.pre1
    v5.9.verfix
    v5.9
    v5.9.rc2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-89147 | CVE-DB