# CVE-2026-26018

## Summary

- **CVE ID:** CVE-2026-26018
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-337, CWE-770, CWE-400
- **Published:** Mar 6, 2026
- **Last Modified:** Jul 15, 2026

## 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 Products

- coredns — coredns (< 1.14.2)

## References

- [CNA](https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278)
- [CNA](https://github.com/coredns/coredns/releases/tag/v1.14.2)
- [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://access.redhat.com/errata/RHSA-2026:25127)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:8151)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36873)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.12%
- **EPSS Percentile:** 64.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._