Red Hat Enterprise Linux (urllib3): Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2026-0207 · first 26.01.2026 · updated 14.10.2026 · CVSS 8,6
What it is about
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen 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:
- Dell NetWorker
- Amazon Linux 2
- Red Hat Enterprise Linux
- SUSE Linux
- Oracle Linux
- IBM Storage Scale
- SUSE openSUSE
- RESF Rocky Linux
- IBM InfoSphere Information Server
- Red Hat OpenStack 17.1
- Dell Avamar
- Red Hat Enterprise Linux 10
and 8 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Splunk Splunk Enterprise DB Connect 4.2.0
- Red Hat OpenShift 1.0.1
- Dell Secure Connect Gateway 5.36.00.16
- IBM Concert 3.0.1.1
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-2026:33154 vom 2026-06-29 access.redhat.com
- RedHat Security Advisory vom 2026-01-25 access.redhat.com
- RedHat Security Advisory vom 2026-01-25 access.redhat.com
- RedHat Security Advisory vom 2026-01-25 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1166 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1176 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1168 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1332 vom 2026-01-27 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-1087 vom 2026-01-27 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-1089 vom 2026-01-27 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-1241 vom 2026-01-27 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-1226 vom 2026-01-27 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:1329 vom 2026-01-27 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-1224 vom 2026-01-27 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:1330 vom 2026-01-27 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1241 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1254 vom 2026-01-26 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-1088 vom 2026-01-27 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:1249 vom 2026-01-26 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-1086 vom 2026-01-26 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:1224 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1239 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1240 vom 2026-01-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1336 vom 2026-01-27 access.redhat.com
- Red Hat Security Advisory RHSA-2026:1337 vom 2026-01-27 access.redhat.com
and 154 more sources in the original advisory
CVE: CVE-2025-66418, CVE-2025-66471, CVE-2026-21441
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.