Detections
Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-19553

high Nessus Plugin ID 353333

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.

 - ssl.SSLContext.wrap_bio() didn't require the server_hostname argument to not be None if ssl.SSLContext.check_hostname was set. Due to a missing parameter check in SSLObject, if the server_hostname argument isn't supplied then hostname verification would be silently skipped. This defect could lead to programs where certificate hostname verification *appeared* to be succeeding with SSLContext.check_hostname = True and no ValueError being raised due to misconfiguration. If the program passes a server_hostname value that isn't an empty string or None to any of these APIs then certificate hostname verification proceeds as expected and the program is not affected by this vulnerability.
 Mitigating this vulnerability doesn't require updating Python or applying the patch. To mitigate, pass a valid non-None and non-empty server_hostname value to SSLContext.wrap_bio(), asyncio.create_connection(), or asyncio.loop.start_tls() and certificate hostname verification will proceed as expected. Upgrading to the latest version of Python or applying the patch only changes the behavior from silently skipping hostname verification to raising a ValueError, similar to SSLContext.wrap_socket(), when server_hostname isn't supplied. (CVE-2026-19553)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-19553

https://security-tracker.debian.org/tracker/CVE-2026-19553

Plugin Details

Severity: High

ID: 353333

File Name: unpatched_CVE_2026_19553.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 9/30/2026

Updated: 10/1/2026

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: Low

Score: 3

Percentile: 23.64

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.4

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

CVSS Score Source: CVE-2026-19553

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

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

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

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, 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: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:centos:centos:platform-python-debug, p-cpe:/a:centos:centos:platform-python-devel, p-cpe:/a:centos:centos:platform-python, p-cpe:/a:centos:centos:python-debug, p-cpe:/a:centos:centos:python-devel, p-cpe:/a:centos:centos:python-distro, p-cpe:/a:centos:centos:python-docs, p-cpe:/a:centos:centos:python-docutils, p-cpe:/a:centos:centos:python-libs, p-cpe:/a:centos:centos:python-nose-docs, p-cpe:/a:centos:centos:python-nose, p-cpe:/a:centos:centos:python-pygments, p-cpe:/a:centos:centos:python-pymongo-doc, p-cpe:/a:centos:centos:python-pymongo, p-cpe:/a:centos:centos:python-pymysql, p-cpe:/a:centos:centos:python-sqlalchemy-doc, p-cpe:/a:centos:centos:python-sqlalchemy, p-cpe:/a:centos:centos:python-test, p-cpe:/a:centos:centos:python-tools, p-cpe:/a:centos:centos:python-unversioned-command, p-cpe:/a:centos:centos:python-virtualenv-doc, p-cpe:/a:centos:centos:python-virtualenv, p-cpe:/a:centos:centos:python-wheel, p-cpe:/a:centos:centos:python3-bson, p-cpe:/a:centos:centos:python3-debug, p-cpe:/a:centos:centos:python3-devel, p-cpe:/a:centos:centos:python3-distro, p-cpe:/a:centos:centos:python3-docs, p-cpe:/a:centos:centos:python3-docutils, p-cpe:/a:centos:centos:python3-idle, p-cpe:/a:centos:centos:python3-libs, p-cpe:/a:centos:centos:python3-nose, p-cpe:/a:centos:centos:python3-pygments, p-cpe:/a:centos:centos:python3-pymongo-gridfs, p-cpe:/a:centos:centos:python3-pymongo, p-cpe:/a:centos:centos:python3-pymysql, p-cpe:/a:centos:centos:python3-scipy, p-cpe:/a:centos:centos:python3-sqlalchemy, p-cpe:/a:centos:centos:python3-test, p-cpe:/a:centos:centos:python3-tkinter, p-cpe:/a:centos:centos:python3-virtualenv, p-cpe:/a:centos:centos:python3-wheel-wheel, p-cpe:/a:centos:centos:python3-wheel, p-cpe:/a:centos:centos:python3.12-debug, p-cpe:/a:centos:centos:python3.12-devel, p-cpe:/a:centos:centos:python3.12-idle, p-cpe:/a:centos:centos:python3.12-libs, p-cpe:/a:centos:centos:python3.12-rpm-macros, p-cpe:/a:centos:centos:python3.12-test, p-cpe:/a:centos:centos:python3.12-tkinter, p-cpe:/a:centos:centos:python3.12, p-cpe:/a:centos:centos:python3.14-debug, p-cpe:/a:centos:centos:python3.14-devel, p-cpe:/a:centos:centos:python3.14-freethreading-debug, p-cpe:/a:centos:centos:python3.14-freethreading-devel, p-cpe:/a:centos:centos:python3.14-freethreading-idle, p-cpe:/a:centos:centos:python3.14-freethreading-libs, p-cpe:/a:centos:centos:python3.14-freethreading-test, p-cpe:/a:centos:centos:python3.14-freethreading-tkinter, p-cpe:/a:centos:centos:python3.14-freethreading, p-cpe:/a:centos:centos:python3.14-idle, p-cpe:/a:centos:centos:python3.14-libs, p-cpe:/a:centos:centos:python3.14-test, p-cpe:/a:centos:centos:python3.14-tkinter, p-cpe:/a:centos:centos:python3.14, p-cpe:/a:centos:centos:python3.9, p-cpe:/a:centos:centos:python36-debug, p-cpe:/a:centos:centos:python36-devel, p-cpe:/a:centos:centos:python36-rpm-macros, p-cpe:/a:centos:centos:python36, p-cpe:/a:centos:centos:python3, p-cpe:/a:centos:centos:python, p-cpe:/a:centos:centos:scipy, p-cpe:/a:centos:centos:tkinter, p-cpe:/a:debian:debian_linux:pypy3, p-cpe:/a:debian:debian_linux:python3.11, p-cpe:/a:debian:debian_linux:python3.13, p-cpe:/a:debian:debian_linux:python3.14, p-cpe:/a:debian:debian_linux:python3.15, p-cpe:/a:redhat:enterprise_linux:platform-python-debug, p-cpe:/a:redhat:enterprise_linux:platform-python-devel, p-cpe:/a:redhat:enterprise_linux:platform-python, p-cpe:/a:redhat:enterprise_linux:python-debug, p-cpe:/a:redhat:enterprise_linux:python-devel, p-cpe:/a:redhat:enterprise_linux:python-distro, p-cpe:/a:redhat:enterprise_linux:python-docs, p-cpe:/a:redhat:enterprise_linux:python-docutils, p-cpe:/a:redhat:enterprise_linux:python-libs, p-cpe:/a:redhat:enterprise_linux:python-nose-docs, p-cpe:/a:redhat:enterprise_linux:python-nose, p-cpe:/a:redhat:enterprise_linux:python-pygments, p-cpe:/a:redhat:enterprise_linux:python-pymongo-doc, p-cpe:/a:redhat:enterprise_linux:python-pymongo, p-cpe:/a:redhat:enterprise_linux:python-pymysql, p-cpe:/a:redhat:enterprise_linux:python-sqlalchemy-doc, p-cpe:/a:redhat:enterprise_linux:python-sqlalchemy, p-cpe:/a:redhat:enterprise_linux:python-test, p-cpe:/a:redhat:enterprise_linux:python-tools, p-cpe:/a:redhat:enterprise_linux:python-unversioned-command, p-cpe:/a:redhat:enterprise_linux:python-virtualenv-doc, p-cpe:/a:redhat:enterprise_linux:python-virtualenv, p-cpe:/a:redhat:enterprise_linux:python-wheel, p-cpe:/a:redhat:enterprise_linux:python3-bson, p-cpe:/a:redhat:enterprise_linux:python3-debug, p-cpe:/a:redhat:enterprise_linux:python3-devel, p-cpe:/a:redhat:enterprise_linux:python3-distro, p-cpe:/a:redhat:enterprise_linux:python3-docs, p-cpe:/a:redhat:enterprise_linux:python3-docutils, p-cpe:/a:redhat:enterprise_linux:python3-idle, p-cpe:/a:redhat:enterprise_linux:python3-libs, p-cpe:/a:redhat:enterprise_linux:python3-nose, p-cpe:/a:redhat:enterprise_linux:python3-pygments, p-cpe:/a:redhat:enterprise_linux:python3-pymongo-gridfs, p-cpe:/a:redhat:enterprise_linux:python3-pymongo, p-cpe:/a:redhat:enterprise_linux:python3-pymysql, p-cpe:/a:redhat:enterprise_linux:python3-scipy, p-cpe:/a:redhat:enterprise_linux:python3-sqlalchemy, p-cpe:/a:redhat:enterprise_linux:python3-test, p-cpe:/a:redhat:enterprise_linux:python3-tkinter, p-cpe:/a:redhat:enterprise_linux:python3-virtualenv, p-cpe:/a:redhat:enterprise_linux:python3-wheel-wheel, p-cpe:/a:redhat:enterprise_linux:python3-wheel, p-cpe:/a:redhat:enterprise_linux:python3.12-debug, p-cpe:/a:redhat:enterprise_linux:python3.12-devel, p-cpe:/a:redhat:enterprise_linux:python3.12-idle, p-cpe:/a:redhat:enterprise_linux:python3.12-libs, p-cpe:/a:redhat:enterprise_linux:python3.12-rpm-macros, p-cpe:/a:redhat:enterprise_linux:python3.12-test, p-cpe:/a:redhat:enterprise_linux:python3.12-tkinter, p-cpe:/a:redhat:enterprise_linux:python3.12, p-cpe:/a:redhat:enterprise_linux:python3.14-debug, p-cpe:/a:redhat:enterprise_linux:python3.14-devel, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-debug, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-devel, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-idle, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-libs, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-test, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading-tkinter, p-cpe:/a:redhat:enterprise_linux:python3.14-freethreading, p-cpe:/a:redhat:enterprise_linux:python3.14-idle, p-cpe:/a:redhat:enterprise_linux:python3.14-libs, p-cpe:/a:redhat:enterprise_linux:python3.14-test, p-cpe:/a:redhat:enterprise_linux:python3.14-tkinter, p-cpe:/a:redhat:enterprise_linux:python3.14, p-cpe:/a:redhat:enterprise_linux:python3.9, p-cpe:/a:redhat:enterprise_linux:python36-debug, p-cpe:/a:redhat:enterprise_linux:python36-devel, p-cpe:/a:redhat:enterprise_linux:python36-rpm-macros, p-cpe:/a:redhat:enterprise_linux:python36, p-cpe:/a:redhat:enterprise_linux:python3, p-cpe:/a:redhat:enterprise_linux:python, p-cpe:/a:redhat:enterprise_linux:scipy, p-cpe:/a:redhat:enterprise_linux:tkinter

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-2026-19553