Detections
Analytics
RHCOS 4 : Red Hat build of MicroShift 4.19.43 (RHSA-2026:54883)
high Nessus Plugin ID 338159
Synopsis
The remote Red Hat CoreOS host is missing a security update for Red Hat build of MicroShift 4.19.43.Description
The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54883 advisory.- net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)
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 Red Hat build of MicroShift 4.19.43 package based on the guidance in RHSA-2026:54883.See Also
https://access.redhat.com/errata/RHSA-2026:54883
https://access.redhat.com/security/updates/classification/#important
Plugin Details
Severity: High
ID: 338159
File Name: rhcos-RHSA-2026-54883.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Red Hat Local Security Checks
Published: 8/19/2026
Updated: 8/19/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.73
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-2026-39820
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:9:coreos, p-cpe:/a:redhat:enterprise_linux:microshift-ai-model-serving-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-ai-model-serving, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-gateway-api, p-cpe:/a:redhat:enterprise_linux:microshift-greenboot, p-cpe:/a:redhat:enterprise_linux:microshift-low-latency, p-cpe:/a:redhat:enterprise_linux:microshift-multus-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-multus, p-cpe:/a:redhat:enterprise_linux:microshift-networking, p-cpe:/a:redhat:enterprise_linux:microshift-observability, p-cpe:/a:redhat:enterprise_linux:microshift-olm-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-olm, p-cpe:/a:redhat:enterprise_linux:microshift-release-info, p-cpe:/a:redhat:enterprise_linux:microshift-selinux, p-cpe:/a:redhat:enterprise_linux:microshift
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: 8/19/2026
Vulnerability Publication Date: 5/7/2026
Reference Information
CVE: CVE-2026-39820
CWE: 606
RHSA: 2026:54883