Red Hat Enterprise Linux (giflib): Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-2137 · first 30.06.2026 · updated 23.07.2026 · 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:
- Red Hat Enterprise Linux
- SUSE Linux
- Oracle Linux
- RESF Rocky Linux
- Ubuntu Linux
- Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
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-2026:33447 vom 2026-06-29 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33450 vom 2026-06-29 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33451 vom 2026-06-29 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33447 vom 2026-06-29 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33456 vom 2026-06-30 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33501 vom 2026-07-01 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:33503 vom 2026-07-01 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:33502 vom 2026-06-30 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33509 vom 2026-06-30 access.redhat.com
- Red Hat Security Advisory RHSA-2026:33503 vom 2026-06-30 access.redhat.com
- SUSE Security Update SUSE-SU-2026:22382-1 vom 2026-07-01 lists.suse.com
- Oracle Linux Security Advisory ELSA-2026-33503 vom 2026-07-01 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:33501 vom 2026-07-01 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-33501 vom 2026-07-02 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:33502 vom 2026-07-05 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:36004 vom 2026-07-06 access.redhat.com
- Red Hat Security Advisory RHSA-2026:36006 vom 2026-07-06 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-19154 vom 2026-07-17 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-33502 vom 2026-07-17 linux.oracle.com
- Ubuntu Security Notice USN-8583-1 vom 2026-07-22 ubuntu.com
CVE: CVE-2026-26740
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.