Detections
Analytics
RHCOS 4 : OpenShift Container Platform 4.21.30 (RHSA-2026:57456)
high Nessus Plugin ID 339467
Language:
Synopsis
The remote Red Hat CoreOS host is missing a security update for OpenShift Container Platform 4.21.30.Description
The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:57456 advisory.- mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
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 4.21.30 packages based on the guidance in RHSA-2026:57456.See Also
https://access.redhat.com/errata/RHSA-2026:57456
https://access.redhat.com/security/updates/classification/#important
Plugin Details
Severity: High
ID: 339467
File Name: rhcos-RHSA-2026-57456.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Red Hat Local Security Checks
Published: 8/25/2026
Updated: 8/25/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.76
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-2026-42504
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: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
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: 8/25/2026
Vulnerability Publication Date: 6/2/2026
Reference Information
CVE: CVE-2026-42504
CWE: 1050
RHSA: 2026:57456