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RHEL 8 : RHUI 4.11.4 security update - python-pyOpenSSL (Important) (RHSA-2026:10754)

critical Nessus Plugin ID 310412

Synopsis

The remote Red Hat host is missing a security update for RHUI 4.11.4.

Description

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:10754 advisory.

 Red Hat Update Infrastructure (RHUI) provides a highly scalable and redundant framework for managing repositories and content. It also allows cloud providers to deliver content and updates to Red Hat Enterprise Linux (RHEL) instances.

 Security Fixes:
 * pyOpenSSL: DTLS cookie callback buffer overflow (CVE-2026-27459)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL RHUI 4.11.4 package based on the guidance in RHSA-2026:10754.

See Also

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2448503

http://www.nessus.org/u?5aecca12

https://access.redhat.com/errata/RHSA-2026:10754

Plugin Details

Severity: Critical

ID: 310412

File Name: redhat-RHSA-2026-10754.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/27/2026

Updated: 4/27/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-27459

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

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:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:python3.11-pyopenssl, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:python-pyopenssl

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 4/27/2026

Vulnerability Publication Date: 3/16/2026

Reference Information

CVE: CVE-2026-27459

CWE: 120

RHSA: 2026:10754