High severity · published Mar 6, 2026
CVE-2026-26018
CoreDNS Loop Detection Denial of Service Vulnerability
7.5
CVSS
1.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coredns · coredns
< 1.14.2 · source: vendor, NVD
RH
Red Hat Advanced Cluster Management for Kubernetes 2.13 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.14 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.15 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Connectivity Link 1 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26018
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26018
Product
https://github.com/coredns/coredns/releases/tag/v1.14.2
Exploit
https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25127
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36873
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:8151
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-26018
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