CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists in CoreDNS's loop detection plugin that allows an attacker to crash the DNS server by sending specially crafted DNS queries. The vulnerability stems from the use of a predictable pseudo-random number generator (PRNG) for generating a secret query name, combined with a fatal error handler that terminates the entire process. This issue has been patched in version 1.14.2.
History

Mon, 09 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Coredns.io
Coredns.io coredns
Vendors & Products Coredns.io
Coredns.io coredns

Sat, 07 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1241
References
Metrics threat_severity

None

threat_severity

Important


Fri, 06 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 15:45:00 +0000

Type Values Removed Values Added
Description CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists in CoreDNS's loop detection plugin that allows an attacker to crash the DNS server by sending specially crafted DNS queries. The vulnerability stems from the use of a predictable pseudo-random number generator (PRNG) for generating a secret query name, combined with a fatal error handler that terminates the entire process. This issue has been patched in version 1.14.2.
Title CoreDNS Loop Detection Denial of Service Vulnerability
Weaknesses CWE-337
CWE-400
CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-06T15:35:50.801Z

Updated: 2026-03-06T16:07:31.587Z

Reserved: 2026-02-09T21:36:29.554Z

Link: CVE-2026-26018

cve-icon Vulnrichment

Updated: 2026-03-06T16:07:26.703Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-06T16:16:10.557

Modified: 2026-03-09T13:35:34.633

Link: CVE-2026-26018

cve-icon Redhat

Severity : Important

Publid Date: 2026-03-06T15:35:50Z

Links: CVE-2026-26018 - Bugzilla