CVE-2026-26018
CoreDNS Loop Detection Denial of Service Vulnerability
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.
INFO
Published Date :
March 6, 2026, 4:16 p.m.
Last Modified :
July 9, 2026, 1:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
- Update CoreDNS to version 1.14.2 or later.
- Apply any available security patches or updates.
- Monitor DNS queries for unusual patterns.
- Review loop detection plugin configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-26018.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-26018 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-26018
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-26018 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-26018 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 09, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:36873 Changed Affected [{'cpes': ['cpe:/a:redhat:acm:2.14::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.14', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:connectivity_link:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Connectivity Link 1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'defaultStatus': 'unaffected'}] [{'cpes': ['cpe:/a:redhat:acm:2.13::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.13', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.14::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.14', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:connectivity_link:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Connectivity Link 1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:acm:2.14::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.14', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:connectivity_link:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Connectivity Link 1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-1241 Added Reference https://access.redhat.com/errata/RHSA-2026:25127 Added Reference https://access.redhat.com/errata/RHSA-2026:8151 Added Reference https://access.redhat.com/security/cve/CVE-2026-26018 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2445242 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26018.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'coredns', 'product': 'coredns', 'versions': [{'status': 'affected', 'version': '< 1.14.2'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-26018', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-06T16:07:22.371186Z'} -
Initial Analysis by [email protected]
Mar. 09, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:* versions up to (excluding) 1.14.2 Added Reference Type GitHub, Inc.: https://github.com/coredns/coredns/releases/tag/v1.14.2 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Mar. 06, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added CWE CWE-337 Added CWE CWE-770 Added Reference https://github.com/coredns/coredns/releases/tag/v1.14.2 Added Reference https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278