RHCOS 4 : OpenShift Container Platform 4.16.69 (RHSA-2026:56852)

critical Nessus Plugin ID 340729

Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.16.69.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:56852 advisory.

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

- net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

- crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)

- net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)

- net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)

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 4.16.69 packages based on the guidance in RHSA-2026:56852.

Plugin Details

Severity: Critical

ID: 340729

File Name: rhcos-RHSA-2026-56852.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 8/26/2026

Updated: 8/26/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.9

Vendor

Vendor Severity: Important

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: cpe:/o:redhat:enterprise_linux:8:coreos, cpe:/o:redhat:enterprise_linux:9:coreos, p-cpe:/a:redhat:enterprise_linux:butane-redistributable, p-cpe:/a:redhat:enterprise_linux:butane, p-cpe:/a:redhat:enterprise_linux:containernetworking-plugins, p-cpe:/a:redhat:enterprise_linux:cri-o, p-cpe:/a:redhat:enterprise_linux:cri-tools, p-cpe:/a:redhat:enterprise_linux:ignition-validate, p-cpe:/a:redhat:enterprise_linux:ignition, p-cpe:/a:redhat:enterprise_linux:openshift-clients-redistributable, p-cpe:/a:redhat:enterprise_linux:openshift-clients, p-cpe:/a:redhat:enterprise_linux:openshift-hyperkube, p-cpe:/a:redhat:enterprise_linux:openshift-kube-apiserver, p-cpe:/a:redhat:enterprise_linux:openshift-kube-controller-manager, p-cpe:/a:redhat:enterprise_linux:openshift-kube-scheduler, p-cpe:/a:redhat:enterprise_linux:openshift-kubelet, p-cpe:/a:redhat:enterprise_linux:openshift, p-cpe:/a:redhat:enterprise_linux:ose-aws-ecr-image-credential-provider, p-cpe:/a:redhat:enterprise_linux:ose-azure-acr-image-credential-provider, p-cpe:/a:redhat:enterprise_linux:ose-gcp-gcr-image-credential-provider, p-cpe:/a:redhat:enterprise_linux:runc, p-cpe:/a:redhat:enterprise_linux:skopeo-tests, p-cpe:/a:redhat:enterprise_linux:skopeo

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: 8/26/2026

Vulnerability Publication Date: 1/22/2026

Reference Information

CVE: CVE-2025-68121, CVE-2026-25679, CVE-2026-32280, CVE-2026-33811, CVE-2026-39820, CVE-2026-42499

CWE: 1046, 1286, 1341, 606, 770

RHSA: 2026:56852

Detections

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