CoreDNS Vulnerabilities Allow Remote Attacks Information Disclosure
Summary
CERT-Bund published security advisory WID-SEC-2026-1283 warning of multiple vulnerabilities in CoreDNS versions prior to 1.14.3. The vulnerabilities carry a CVSS Base Score of 7.5 (high) and enable remote anonymous attackers to bypass security measures, disclose confidential information, or cause denial-of-service conditions. The advisory, issued on April 26, 2026, confirms that mitigations are available. Affected parties include operators of DNS infrastructure using vulnerable versions of the open-source CoreDNS 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.”
IT security teams running CoreDNS should immediately inventory their DNS deployments and confirm versions in use. The CVSS 7.5 base score and confirmed remote exploitability indicate this should be treated as a priority patch cycle rather than routine maintenance. Organizations using CoreDNS in containerized or Kubernetes environments should verify base images and helm charts include the patched version.
About this source
CERT-Bund is the German federal cybersecurity agency's incident response team, run by the BSI. Their advisory feed publishes vulnerability disclosures and active exploitation warnings for software in widespread enterprise use: VPN appliances, email servers, file transfer products, ERP systems, browsers, hypervisors. Around 280 advisories a month, each with a CVSS score, affected versions, and remediation guidance. The advisories are written in German but cover the same vulnerabilities that show up in CISA, NCSC-UK, and JPCERT bulletins, often hours earlier. Watch this if you patch enterprise software, run a SOC, or write detection rules. GovPing publishes each advisory with the affected vendor, CVSS score, and original CERT-Bund link.
What changed
CERT-Bund issued a security advisory disclosing multiple vulnerabilities in the open-source CoreDNS DNS server software affecting all versions prior to 1.14.3. The vulnerabilities carry a CVSS Base Score of 7.5 (high) and a Temporal Score of 6.7 (medium), with confirmed remote attack feasibility.
Organizations operating CoreDNS as their DNS infrastructure must prioritise patching to version 1.14.3 or later. The vulnerabilities allow an anonymous remote attacker to bypass security controls, exfiltrate sensitive information, or trigger service outages. Failure to address these vulnerabilities could expose DNS resolution services to compromise, affecting all dependent systems and applications relying on name resolution.
What to do next
- Check CoreDNS versions and apply updates to version 1.14.3 or later
- Review DNS infrastructure for signs of exploitation
- Implement available mitigations as referenced in the advisory
Archived snapshot
Apr 27, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
[WID-SEC-2026-1283] CoreDNS: Mehrere Schwachstellen ermöglichen CVSS Base Score 7.5 (hoch) CVSS Temporal Score 6.7 (mittel) Remoteangriff ja Datum 26.04.2026 Stand 27.04.2026 Mitigation ja
Betroffene Systeme
Betriebssystem
- Sonstiges
- UNIX
Produktbeschreibung
CoreDNS ist ein DNS server.
Produkte
26.04.2026
- Open Source CoreDNS <1.14.3
Angriff
Angriff
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. CVE Informationen Versionshistorie Feedback zum Advisory geben
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