Vulnerability CVE-2026-26018: Information

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.

Severity: HIGH (7.5)

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26018

Published: March 6, 2026

Modified: March 9, 2026

Error type identifier: CWE-337, CWE-400, CWE-770

References to Advisories, Solutions, and Tools

Hyperlink	Resource
https://github.com/coredns/coredns/releases/tag/v1.14.2	Product Release Notes
https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278	Vendor Advisory Exploit
GHSA-h75p-j8xm-m278	GHSA

Affected configurations:
1. cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*
  End excluding
  1.14.2

Version: v26.6.1