Red Hat Enterprise Linux (python-idna): Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-2797 · first 12.08.2026 · updated 22.10.2026 · CVSS 5,3
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 (python-idna) 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:
- Red Hat Enterprise Linux
- RESF Rocky Linux
- Oracle Linux
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Data Foundation
- Dell Secure Connect Gateway <5.36.00.16
- Splunk SOAR <8.7.0
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Dell Secure Connect Gateway 5.36.00.16
- Splunk SOAR 8.7.0
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)
- Red Hat Security Advisory RHSA-2026:54290 vom 2026-08-11 access.redhat.com
- Red Hat Security Advisory RHSA-2026:54484 vom 2026-08-13 access.redhat.com
- Red Hat Security Advisory RHSA-2026:54481 vom 2026-08-13 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:54290 vom 2026-08-13 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-54290 vom 2026-08-13 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-54481 vom 2026-08-14 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:54484 vom 2026-08-13 errata.build.resf.org
- Rocky Linux Security Advisory RLSA-2026:54481 vom 2026-08-13 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-54484 vom 2026-08-15 oss.oracle.com
- Red Hat Security Advisory RHSA-2026:56431 vom 2026-08-19 access.redhat.com
- Red Hat Security Advisory RHSA-2026:61783 vom 2026-09-01 access.redhat.com
- Dell Security Advisory DSA-2026-385 vom 2026-08-31 www.dell.com
- Splunk Security Advisory SVD-2026-1012 vom 2026-10-22 advisory.splunk.com
CVE: CVE-2026-45409
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.