rsyslog: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-3094 · first 31.08.2026 · updated 29.10.2026 · CVSS 7,5
What it is about
rsyslog ist ein erweiterter, multithread syslog Dämon der MySQL, syslog/TCP, RFC 3195, "permitted sender" Listen, Filterfunktionen für einzelne Nachrichtenteile und eine fein granulierte Steuerung des Ausgabeformates bietet. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in rsyslog 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:
- IBM AIX 7.3
- IBM VIOS 4.1
- Amazon Linux 2
- IBM AIX 7.2
- Red Hat Enterprise Linux
- RESF Rocky Linux
- SUSE Linux
- Ubuntu Linux
- Oracle Linux
- Open Source rsyslog <2026-08-24 daily stable build
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source rsyslog 2026-08-24 daily stable build
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)
- GitHub Security Advisory GHSA-g72f-gc6v-f2w3 vom 2026-08-30 github.com
- OSS Security Mailing List vom 2026-08-30 seclists.org
- Amazon Linux Security Advisory ALAS2-2026-3904 vom 2026-09-14 alas.aws.amazon.com
- Red Hat Security Advisory RHSA-2026:69540 vom 2026-09-22 access.redhat.com
- Ubuntu Security Notice USN-8786-1 vom 2026-09-21 ubuntu.com
- Oracle Linux Security Advisory ELSA-2026-69541 vom 2026-09-22 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:69541 vom 2026-09-22 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-69540 vom 2026-09-22 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:69541 vom 2026-09-23 errata.build.resf.org
- Rocky Linux Security Advisory RLSA-2026:69540 vom 2026-09-24 errata.build.resf.org
- IBM Security Bulletin 7291353 vom 2026-10-09 www.ibm.com
- SUSE Security Update SUSE-SU-2026:4611-1 vom 2026-10-09 lists.suse.com
- Red Hat Security Advisory RHSA-2026:81321 vom 2026-10-12 access.redhat.com
- Red Hat Security Advisory RHSA-2026:80817 vom 2026-10-13 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-80817 vom 2026-10-13 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:80817 vom 2026-10-14 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:84576 vom 2026-10-19 access.redhat.com
- Red Hat Security Advisory RHSA-2026:87408 vom 2026-10-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:90349 vom 2026-10-26 access.redhat.com
- Red Hat Security Advisory RHSA-2026:91582 vom 2026-10-28 access.redhat.com
CVE: CVE-2026-78002
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.