CVE catalog

CVE-2026-89147

Net-SNMP through 5.9.5.2 contains a denial of service…

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.

Severity: High · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 11, 2026, 11:16:00 AM UTC
Updated: Sep 11, 2026, 11:16:58 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.49% · Oct 27, 2026

Projects and upstream resources

[net-snmp][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "net-snmp",
      "status": "fixed",
      "release": "sid",
      "version": "5.9.5.2+dfsg-3"
    },
    {
      "name": "net-snmp",
      "status": "fixed",
      "release": "forky",
      "version": "5.9.5.2+dfsg-3"
    },
    {
      "name": "net-snmp",
      "status": "vulnerable",
      "release": "trixie",
      "version": "5.9.4+dfsg-2+deb13u1"
    },
    {
      "name": "net-snmp",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "5.9.4+dfsg-2+deb13u1"
    },
    {
      "name": "net-snmp",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "5.9.3+dfsg-2+deb12u1"
    },
    {
      "name": "net-snmp",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "5.9.3+dfsg-2+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1147442,
      "name": "net-snmp",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "5.9.5.2+dfsg-3"
    },
    {
      "bug": 1147442,
      "name": "net-snmp",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "5.9.5.2+dfsg-3"
    },
    {
      "bug": 1147442,
      "name": "net-snmp",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1147442,
      "name": "net-snmp",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "net-snmp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "5.7.3+dfsg-5ubuntu5",
        "5.7.3+dfsg-5ubuntu6",
        "5.8+dfsg-2ubuntu1",
        "5.8+dfsg-2ubuntu2",
        "5.8+dfsg-2ubuntu2.1",
        "5.8+dfsg-2ubuntu2.2",
        "5.8+dfsg-2ubuntu2.3",
        "5.8+dfsg-2ubuntu2.4",
        "5.8+dfsg-2ubuntu2.5",
        "5.8+dfsg-2ubuntu2.6",
        "5.8+dfsg-2ubuntu2.7",
        "5.8+dfsg-2ubuntu2.9",
        "5.8+dfsg-2ubuntu2.9+esm1",
        "5.8+dfsg-2ubuntu2.9+esm2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-89147"
    },
    {
      "name": "net-snmp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "5.9+dfsg-3ubuntu2",
        "5.9+dfsg-3ubuntu3",
        "5.9+dfsg-3ubuntu4",
        "5.9.1+dfsg-1ubuntu1",
        "5.9.1+dfsg-1ubuntu2",
        "5.9.1+dfsg-1ubuntu2.1",
        "5.9.1+dfsg-1ubuntu2.2",
        "5.9.1+dfsg-1ubuntu2.4",
        "5.9.1+dfsg-1ubuntu2.5",
        "5.9.1+dfsg-1ubuntu2.6",
        "5.9.1+dfsg-1ubuntu2.7",
        "5.9.1+dfsg-1ubuntu2.8",
        "5.9.1+dfsg-1ubuntu2.9"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-89147"
    },
    {
      "name": "net-snmp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "5.9.3+dfsg-2ubuntu3",
        "5.9.4+dfsg-1ubuntu1",
        "5.9.4+dfsg-1ubuntu2",
        "5.9.4+dfsg-1.1ubuntu2",
        "5.9.4+dfsg-1.1ubuntu3",
        "5.9.4+dfsg-1.1ubuntu3.1",
        "5.9.4+dfsg-1.1ubuntu3.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-89147"
    },
    {
      "name": "net-snmp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "5.9.4+dfsg-2ubuntu2",
        "5.9.4+dfsg-2ubuntu3"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-89147"
    }
  ]
}

[Debian bug #1147442]

Publisher notes

[trixie] net-snmp: Minor issue [bookworm] net-snmp: Minor issue, DoS

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libnetsnmptrapd40]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[libsnmp40]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[libsnmp-base]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[libsnmp-dev]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[libsnmp-perl]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[snmp]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[snmpd]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[snmptrapd]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
[tkmib]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.3+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12
- 5.9.3+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · net-snmp · debian · bookworm; nvd · net-snmp · debian · 12

[Debian 13 (Trixie)]

[libnetsnmptrapd40t64]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[libsnmp40t64]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[libsnmp-base]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · all · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[libsnmp-dev]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[libsnmp-perl]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[snmp]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[snmpd]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[snmptrapd]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · amd64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · arm64 · trixie-security
  Affected
  nvd · net-snmp · debian · 13
[tkmib]Unknown
Source package: [net-snmp]
Details (4)
- 5.9.4+dfsg-2+deb13u1 · all · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie-security
  Affected
  nvd · net-snmp · debian · 13
- 5.9.4+dfsg-2+deb13u1 · all · trixie-security
  Affected
  nvd · net-snmp · debian · 13

Observed: Oct 27, 2026, 6:29:33 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]