RHCOS 4 : OpenShift Container Platform 4.12.99 (RHSA-2026:70645)

high Nessus Plugin ID 362463

Synopsis

The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.12.99.

Description

The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:70645 advisory.

- crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145)

- encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)

- golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)

- mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

- encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)

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 4.12.99 packages based on the guidance in RHSA-2026:70645.

Plugin Details

Severity: High

ID: 362463

File Name: rhcos-RHSA-2026-70645.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.89

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-39821

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

Temporal Vector: CVSS:3.0/E:U/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:cri-o, p-cpe:/a:redhat:enterprise_linux:cri-tools, 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

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: 10/1/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-27145, CVE-2026-33818, CVE-2026-39821, CVE-2026-42504, CVE-2026-56859, CVE-2026-56860, CVE-2026-56862

CWE: 1050, 1289, 606, 770, 776

RHSA: 2026:70645

Detections

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