RHCOS 4 : OpenShift Container Platform 4.21.34 (RHSA-2026:68538)

high Nessus Plugin ID 348765

Synopsis

The remote Red Hat CoreOS host is missing a security update for OpenShift Container Platform 4.21.34.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:68538 advisory.

- crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)

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 RHCOS OpenShift Container Platform 4.21.34 packages based on the guidance in RHSA-2026:68538.

Plugin Details

Severity: High

ID: 348765

File Name: rhcos-RHSA-2026-68538.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/22/2026

Updated: 9/22/2026

Supported Sensors: Agentless Assessment, Continuous 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: 3

Percentile: 23.65

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-56862

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10:coreos, cpe:/o:redhat:enterprise_linux:8:coreos, cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:ose-gcp-gcr-image-credential-provider

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: 9/22/2026

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2026-56862

CWE: 1050

RHSA: 2026:68538

Detections

Analytics