Red Hat Enterprise Linux (pyasn1): Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-0306 · first 05.02.2026 · updated 09.10.2026 · CVSS 7,5
What it is about
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Amazon Linux 2
- Red Hat Enterprise Linux
- Fedora Linux
- Red Hat Ansible Automation Platform 2.6
- Ubuntu Linux
- SUSE Linux
- Oracle Linux
- RESF Rocky Linux
- Red Hat OpenStack 17.1
- IBM DB2
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux 10
and 5 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Red Hat OpenShift Container Platform 4.18.42
- Red Hat OpenShift Container Platform 4.17.54
- Splunk SOAR 8.5.0
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- RedHat Security Advisory vom 2026-02-04 access.redhat.com
- RedHat Security Advisory vom 2026-02-04 access.redhat.com
- RedHat Security Advisory vom 2026-02-04 access.redhat.com
- RedHat Security Advisory vom 2026-02-04 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:1903 vom 2026-02-05 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-1903 vom 2026-02-06 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-1905 vom 2026-02-05 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-1906 vom 2026-02-06 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:2221 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2300 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2303 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2309 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2302 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2299 vom 2026-02-09 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2486 vom 2026-02-10 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2483 vom 2026-02-10 access.redhat.com
- Fedora Security Advisory FEDORA-2026-DDAFE1357A vom 2026-02-10 bodhi.fedoraproject.org
- Red Hat Security Advisory RHSA-2026:2460 vom 2026-02-10 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2453 vom 2026-02-10 access.redhat.com
- Fedora Security Advisory FEDORA-2026-0179C9B8AC vom 2026-02-10 bodhi.fedoraproject.org
- SUSE Security Update SUSE-SU-2026:0430-1 vom 2026-02-11 lists.suse.com
- Red Hat Security Advisory RHSA-2026:2712 vom 2026-02-16 access.redhat.com
- Red Hat Security Advisory RHSA-2026:2758 vom 2026-02-16 access.redhat.com
- Red Hat Security Advisory RHSA-2026:3354 vom 2026-02-25 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-3359 vom 2026-02-26 linux.oracle.com
and 49 more sources in the original advisory
CVE: CVE-2026-23490
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.