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Vulnerability record · CVE-2026-26018 · published 6 March 2026

CVE-2026-26018: Coredns.io coredns uncontrolled resource consumption vulnerability

CCoredns.Io · Coredns

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.

7.5 CVSS 3.1 High EPSS 0.76% · top 46.7% CWE-337 · CWE-337CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 1 tagged exploit
15 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/coredns/coredns/releases/tag/v1.14.2 ProductRelease Notes
https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278 ExploitVendor Advisory
https://access.redhat.com/errata/RHSA-2026:25127
https://access.redhat.com/errata/RHSA-2026:36873
https://access.redhat.com/errata/RHSA-2026:8151
https://access.redhat.com/security/cve/CVE-2026-26018
https://bugzilla.redhat.com/show_bug.cgi?id=2445242
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26018.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2026-32936Coredns.io coredns uncontrolled resource consumption vulnerabilityCoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter va…EPSS 0.61%8.7CVE-2026-33190Coredns.io coredns vulnerabilityCoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3…EPSS 0.53%8.7CVE-2026-32934Coredns.io coredns allocation without limits vulnerabilityCoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and m…EPSS 0.63%8.2CVE-2026-35579Coredns.io coredns improper authentication vulnerabilityCoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport implementations incorrectly handle TSIG a…EPSS 0.75%8.2CVE-2026-33489Coredns.io coredns incorrect authorization vulnerabilityCoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone…EPSS 0.42%7.5CVE-2026-62309Coredns.io coredns null pointer dereference vulnerabilityCoreDNS is a DNS server written in Go. Prior to 1.14.4, a single 28-byte UDP datagram can crash the CoreDNS process when the proxyproto plugin is ena…EPSS 0.66%7.5CVE-2025-47950Coredns.io coredns allocation without limits vulnerabilityCoreDNS is a DNS server that chains plugins. In versions prior to 1.12.2, a Denial of Service (DoS) vulnerability exists in the CoreDNS DNS-over-QUIC…EPSS 1.2%7.5CVE-2023-30464Coredns.io coredns authentication bypass by spoofing vulnerabilityCoreDNS through 1.10.1 enables attackers to achieve DNS cache poisoning and inject fake responses via a birthday attack.EPSS 0.41%

Source: NIST National Vulnerability Database (record CVE-2026-26018), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.