CoreDNS: Schwachstelle ermöglicht Manipulation von DNS Einträgen
WID-SEC-2026-3198 · first 07.09.2026 · updated 17.09.2026 · CVSS 7,5
What it is about
CoreDNS ist ein DNS server. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in CoreDNS ausnutzen, um DNS Einträge zu manipulieren.
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
- DNS Einträge zu manipulieren
Am I affected?
Affected according to the BSI:
- Open Source CoreDNS <1.14.7
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 1.14.7
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
CVE: CVE-2026-86003
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.