RHCOS 4 : OpenShift Container Platform 4.19.27 (RHSA-2026:5876)

critical Nessus Plugin ID 311532

Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.19.27.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:5876 advisory.

- golang: archive/tar: Unbounded allocation when parsing GNU sparse map (CVE-2025-58183)

- crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)

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

Solution

Update the RHCOS OpenShift Container Platform 4.19.27 packages based on the guidance in RHSA-2026:5876.

Plugin Details

Severity: Critical

ID: 311532

File Name: rhcos-RHSA-2026-5876.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 5/2/2026

Updated: 5/2/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.1

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2025-68121

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

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

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:skopeo, p-cpe:/a:redhat:enterprise_linux:runc, cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:skopeo-tests

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/1/2026

Vulnerability Publication Date: 10/23/2025

Reference Information

CVE: CVE-2025-58183, CVE-2025-68121

CWE: 770

RHSA: 2026:5876

Detections

Analytics