Apache log4j: Mehrere Schwachstellen ermöglichen Manipulation von Dateien
WID-SEC-2026-1067 · first 13.04.2026 · updated 26.10.2026 · CVSS 5,8
What it is about
Apache log4j ist ein Framework zum Loggen von Anwendungsmeldungen in Java. Ein Angreifer kann mehrere Schwachstellen in Apache log4j ausnutzen, um Dateien zu manipulieren.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Dateien zu manipulieren
Am I affected?
Affected according to the BSI:
- Google Cloud Platform
- Red Hat Enterprise Linux
- HCL Domino Rest API
- SUSE Linux
- IBM Tivoli Netcool/OMNIbus
- IBM Operational Decision Manager
- IBM SPSS Modeler
- SUSE openSUSE
- IBM License Metric Tool
- IBM InfoSphere Information Server
- IBM SPSS Collaboration and Deployment Services
- IBM Spectrum Protect Plus
and 17 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Apache log4j 2.25.4
- Splunk Splunk Enterprise 10.4.0
- Splunk Splunk Enterprise 10.2.4
- Splunk Splunk Enterprise 10.0.7
- Splunk Splunk Enterprise 9.4.12
- Splunk Splunk Enterprise 9.3.13
- IBM License Metric Tool 9.2.44
- IBM QRadar SIEM 7.5.0 UP16
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-6HG6-V5C8-FPHQ vom 2026-04-12 github.com
- GitHub Security Advisory GHSA-445C-VH5M-36RJ vom 2026-04-12 github.com
- GitHub Security Advisory GHSA-H383-GMXW-35V2 vom 2026-04-12 github.com
- GitHub Security Advisory GHSA-3pxv-7cmr-fjr4 vom 2026-04-12 github.com
- GitHub Security Advisory GHSA-w35j-pv5h-q9q9 vom 2026-04-12 github.com
- Microsoft Security Update Guide vom 2026-04-14 msrc.microsoft.com
- openSUSE Security Update OPENSUSE-SU-2026:10544-1 vom 2026-04-15 lists.opensuse.org
- SUSE Security Update SUSE-SU-2026:1843-1 vom 2026-05-13 lists.suse.com
- IBM Security Bulletin 7278671 vom 2026-07-01 www.ibm.com
- Red Hat Security Advisory RHSA-2026:34608 vom 2026-07-02 access.redhat.com
- IBM Security Bulletin 7273809 vom 2026-05-22 www.ibm.com
- IBM Security Bulletin 7274080 vom 2026-05-26 www.ibm.com
- IBM Security Bulletin 7274227 vom 2026-05-27 www.ibm.com
- Red Hat Security Advisory RHSA-2026:21773 vom 2026-05-29 access.redhat.com
- Red Hat Security Advisory RHSA-2026:22619 vom 2026-06-02 access.redhat.com
- Splunk Security Advisory SVD-2026-0610 vom 2026-06-10 advisory.splunk.com
- IBM Security Bulletin 7275937 vom 2026-06-11 www.ibm.com
- IBM Security Bulletin 7276777 vom 2026-06-23 www.ibm.com
- IBM Security Bulletin 7277420 vom 2026-06-23 www.ibm.com
- Google Cloud Platform Security Bulletin GCP-2026-041 vom 2026-06-24 docs.cloud.google.com
- IBM Security Bulletin 7275287 vom 2026-06-24 www.ibm.com
- IBM Security Bulletin 7278011 vom 2026-06-25 www.ibm.com
- Red Hat Security Advisory RHSA-2026:37390 vom 2026-07-09 access.redhat.com
- IBM Security Bulletin 7279458 vom 2026-07-10 www.ibm.com
- Red Hat Security Advisory RHSA-2026:42644 vom 2026-07-21 access.redhat.com
and 15 more sources in the original advisory
CVE: CVE-2026-34477, CVE-2026-34478, CVE-2026-34479, CVE-2026-34480, CVE-2026-34481
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.