Linux Distros Unpatched Vulnerability : CVE-2026-5950

medium Nessus Plugin ID 315769

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1. (CVE-2026-5950)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 315769

File Name: unpatched_CVE_2026_5950.nasl

Version: 1.16

Type: Local

Agent: unix

Family: Misc.

Published: 5/20/2026

Updated: 8/8/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-5950

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:bind9-libs, p-cpe:/a:canonical:ubuntu_linux:isc-dhcp, p-cpe:/a:centos:centos:bind-chroot, p-cpe:/a:centos:centos:bind-devel, p-cpe:/a:centos:centos:bind-dnssec-doc, p-cpe:/a:centos:centos:bind-dnssec-utils, p-cpe:/a:centos:centos:bind-doc, p-cpe:/a:centos:centos:bind-export-devel, p-cpe:/a:centos:centos:bind-export-libs, p-cpe:/a:centos:centos:bind-libs-lite, p-cpe:/a:centos:centos:bind-libs, p-cpe:/a:centos:centos:bind-license, p-cpe:/a:centos:centos:bind-lite-devel, p-cpe:/a:centos:centos:bind-pkcs11-devel, p-cpe:/a:centos:centos:bind-pkcs11-libs, p-cpe:/a:centos:centos:bind-pkcs11-utils, p-cpe:/a:centos:centos:bind-pkcs11, p-cpe:/a:centos:centos:bind-sdb-chroot, p-cpe:/a:centos:centos:bind-sdb, p-cpe:/a:centos:centos:bind-utils, p-cpe:/a:centos:centos:bind9.16-chroot, p-cpe:/a:centos:centos:bind9.16-devel, p-cpe:/a:centos:centos:bind9.16-dnssec-utils, p-cpe:/a:centos:centos:bind9.16-doc, p-cpe:/a:centos:centos:bind9.16-libs, p-cpe:/a:centos:centos:bind9.16-license, p-cpe:/a:centos:centos:bind9.16-utils, p-cpe:/a:centos:centos:bind9.16, p-cpe:/a:centos:centos:bind9.18-chroot, p-cpe:/a:centos:centos:bind9.18-devel, p-cpe:/a:centos:centos:bind9.18-dnssec-utils, p-cpe:/a:centos:centos:bind9.18-doc, p-cpe:/a:centos:centos:bind9.18-libs, p-cpe:/a:centos:centos:bind9.18-utils, p-cpe:/a:centos:centos:bind9.18, p-cpe:/a:centos:centos:bind, p-cpe:/a:centos:centos:dhcp-client, p-cpe:/a:centos:centos:dhcp-common, p-cpe:/a:centos:centos:dhcp-relay, p-cpe:/a:centos:centos:dhcp-server, p-cpe:/a:centos:centos:dhcp, p-cpe:/a:centos:centos:python3-bind9.16, p-cpe:/a:centos:centos:python3-bind, p-cpe:/a:redhat:enterprise_linux:bind-chroot, p-cpe:/a:redhat:enterprise_linux:bind-devel, p-cpe:/a:redhat:enterprise_linux:bind-dnssec-doc, p-cpe:/a:redhat:enterprise_linux:bind-dnssec-utils, p-cpe:/a:redhat:enterprise_linux:bind-doc, p-cpe:/a:redhat:enterprise_linux:bind-export-devel, p-cpe:/a:redhat:enterprise_linux:bind-export-libs, p-cpe:/a:redhat:enterprise_linux:bind-libs-lite, p-cpe:/a:redhat:enterprise_linux:bind-libs, p-cpe:/a:redhat:enterprise_linux:bind-license, p-cpe:/a:redhat:enterprise_linux:bind-lite-devel, p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-devel, p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-libs, p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-utils, p-cpe:/a:redhat:enterprise_linux:bind-pkcs11, p-cpe:/a:redhat:enterprise_linux:bind-sdb-chroot, p-cpe:/a:redhat:enterprise_linux:bind-sdb, p-cpe:/a:redhat:enterprise_linux:bind-utils, p-cpe:/a:redhat:enterprise_linux:bind9.16-chroot, p-cpe:/a:redhat:enterprise_linux:bind9.16-devel, p-cpe:/a:redhat:enterprise_linux:bind9.16-dnssec-utils, p-cpe:/a:redhat:enterprise_linux:bind9.16-doc, p-cpe:/a:redhat:enterprise_linux:bind9.16-libs, p-cpe:/a:redhat:enterprise_linux:bind9.16-license, p-cpe:/a:redhat:enterprise_linux:bind9.16-utils, p-cpe:/a:redhat:enterprise_linux:bind9.16, p-cpe:/a:redhat:enterprise_linux:bind9.18-chroot, p-cpe:/a:redhat:enterprise_linux:bind9.18-devel, p-cpe:/a:redhat:enterprise_linux:bind9.18-dnssec-utils, p-cpe:/a:redhat:enterprise_linux:bind9.18-doc, p-cpe:/a:redhat:enterprise_linux:bind9.18-libs, p-cpe:/a:redhat:enterprise_linux:bind9.18-utils, p-cpe:/a:redhat:enterprise_linux:bind9.18, p-cpe:/a:redhat:enterprise_linux:bind, p-cpe:/a:redhat:enterprise_linux:dhcp-client, p-cpe:/a:redhat:enterprise_linux:dhcp-common, p-cpe:/a:redhat:enterprise_linux:dhcp-relay, p-cpe:/a:redhat:enterprise_linux:dhcp-server, p-cpe:/a:redhat:enterprise_linux:dhcp, p-cpe:/a:redhat:enterprise_linux:python3-bind9.16, p-cpe:/a:redhat:enterprise_linux:python3-bind

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-5950

Detections

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