CoreDNS: Mehrere Schwachstellen ermöglichen
WID-SEC-2026-1283 · first 27.04.2026 · updated 22.09.2026 · CVSS 7,5
What it is about
CoreDNS ist ein DNS server. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in CoreDNS ausnutzen, um Sicherheitsmaßnahmen zu umgehen und so vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
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
- Sicherheitsmaßnahmen zu umgehen
- so vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- SUSE openSUSE
- Microsoft Azure Linux azl3
- Open Source CoreDNS <1.14.3
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source CoreDNS 1.14.3
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-2wpx-qpw2-g5h5 vom 2026-04-26 github.com
- GitHub Security Advisory GHSA-63cw-r7xf-jmwr vom 2026-04-26 github.com
- GitHub Security Advisory GHSA-h8mm-c463-wjq3 vom 2026-04-26 github.com
- GitHub Security Advisory GHSA-qhmp-q7xh-99rh vom 2026-04-26 github.com
- GitHub Security Advisory GHSA-vp29-5652-4fw9 vom 2026-04-26 github.com
- openSUSE Security Update OPENSUSE-SU-2026:10673-1 vom 2026-05-05 lists.opensuse.org
- Microsoft Security Update Guide vom 2026-05-12 msrc.microsoft.com
- Red Hat Security Advisory RHSA-2026:25127 vom 2026-06-11 access.redhat.com
- CoreDNS-1.14.3 Release vom 2026-07-02 coredns.io
- openSUSE Security Update OPENSUSE-SU-2026:0324-1 vom 2026-09-21 lists.opensuse.org
CVE: CVE-2026-33190, CVE-2026-33489, CVE-2026-35579, CVE-2026-32934, CVE-2026-32936
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.