Log in Start free

Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

CVE-2026-26018CoreDNS Loop Detection Denial of Service Vulnerability

High 7.5

In plain English

A high-severity resource allocation without limits in coredns from coredns. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.2%top 30.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/coredns/coredns1.14.2GHSA-h75p-j8xm-m278
Gogithub.com/coredns/coredns1.14.2GO-2026-4635

Affected products (as reported)

VendorProductVersions
coredns coredns < 1.14.2

Weakness: CWE-337, CWE-770, CWE-400, CWE-1241 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References