Linux Distros Unpatched Vulnerability : CVE-2026-19445

critical Nessus Plugin ID 358379

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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.

- A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns a different context to SSLSocket.context (the documented way to select a certificate per server name) and nothing else keeps the original ssl.SSLContext alive. Typical cases are servers that create an SSLContext per connection or replace it while connections are open; servers that wrap their listening socket with it are not affected. Mitigation: keep a reference to every SSLContext that sets sni_callback for the lifetime of the server. TLS clients are not affected. (CVE-2026-19445)

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: 358379

File Name: unpatched_CVE_2026_19445.nasl

Version: 1.9

Type: Local

Agent: unix

Family: Misc.

Published: 10/1/2026

Updated: 10/21/2026

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: 4.9

Percentile: 58.39

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 6

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

CVSS Score Source: CVE-2026-19445

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.4

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, 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:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:debian:debian_linux:14.0, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:python2.7, p-cpe:/a:canonical:ubuntu_linux:python3.10, p-cpe:/a:canonical:ubuntu_linux:python3.11, p-cpe:/a:canonical:ubuntu_linux:python3.12, p-cpe:/a:canonical:ubuntu_linux:python3.14, p-cpe:/a:canonical:ubuntu_linux:python3.4, p-cpe:/a:canonical:ubuntu_linux:python3.5, p-cpe:/a:canonical:ubuntu_linux:python3.6, p-cpe:/a:canonical:ubuntu_linux:python3.7, p-cpe:/a:canonical:ubuntu_linux:python3.8, p-cpe:/a:canonical:ubuntu_linux:python3.9, p-cpe:/a:centos:centos:python-unversioned-command, p-cpe:/a:centos:centos:python3-debug, p-cpe:/a:centos:centos:python3-devel, p-cpe:/a:centos:centos:python3-idle, p-cpe:/a:centos:centos:python3-libs, p-cpe:/a:centos:centos:python3-test, p-cpe:/a:centos:centos:python3-tkinter, p-cpe:/a:centos:centos:python3.9, p-cpe:/a:centos:centos:python3, p-cpe:/a:debian:debian_linux:pypy3, p-cpe:/a:debian:debian_linux:python3.13, p-cpe:/a:redhat:enterprise_linux:python-unversioned-command, p-cpe:/a:redhat:enterprise_linux:python3-debug, p-cpe:/a:redhat:enterprise_linux:python3-devel, p-cpe:/a:redhat:enterprise_linux:python3-idle, p-cpe:/a:redhat:enterprise_linux:python3-libs, p-cpe:/a:redhat:enterprise_linux:python3-test, p-cpe:/a:redhat:enterprise_linux:python3-tkinter, p-cpe:/a:redhat:enterprise_linux:python3.9, p-cpe:/a:redhat:enterprise_linux:python3

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/30/2026

Reference Information

CVE: CVE-2026-19445

Detections

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