CVE-2026-26018 Details
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.
A denial-of-service vulnerability has been identified in CoreDNS versions prior to 1.14.2, specifically within the loop detection plugin. This vulnerability allows an attacker to crash the DNS server by sending specially crafted DNS queries. The issue arises from a predictable pseudo-random number generator used to create a secret query name, coupled with a fatal error handler that abruptly terminates the entire process. When the server receives multiple matching queries, it mistakenly assumes a forwarding loop exists and crashes the server.
Users can upgrade to CoreDNS version 1.14.2 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:25127 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:36873 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:8151 | redhat-SADP | |
| https://access.redhat.com/security/cve/CVE-2026-26018 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2445242 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26018.json | redhat-SADP | |
| https://github.com/coredns/coredns/releases/tag/v1.14.2 | [email protected] | ProductRelease Notes |
| https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1241 | Use of Predictable Algorithm in Random Number Generator | redhat-SADP |
| CWE-337 | Predictable Seed in Pseudo-Random Number Generator (PRNG) | [email protected] |
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| coredns.io coredns | < 1.14.2 |
CPE
Remediation
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Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 9, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Mar 9, 2026 | Initial Analysis | [email protected] |
| Mar 6, 2026 | New CVE Received | [email protected] |