Linux Distros Unpatched Vulnerability : CVE-2026-11771

critical Nessus Plugin ID 324930

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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.

- The vulnerability exists due to a 1-byte buffer overrun condition within the NTLMv2 proxy authentication parsing pipeline. When configured to route traffic through an HTTP proxy, an unauthenticated proxy or network attacker can intercept and return a malformed NTLMv2 response header, triggering memory corruption that crashes the client or server daemon. (CVE-2026-11771)

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: Critical

ID: 324930

File Name: unpatched_CVE_2026_11771.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 7/3/2026

Updated: 7/15/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.71

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

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

CVSS Score Source: CVE-2026-11771

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.3

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:canonical:ubuntu_linux:openvpn, p-cpe:/a:debian:debian_linux:openvpn

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

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-11771

Detections

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