CVE•Published 2026-03-06•Modified 2026-07-15•0 articles on news•5 live references•NVD data

CVE-2026-26018Coredns.io · Coredns

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 38% of all CVEs

Weaknesses (CWE)

CWE-337Predictable Seed in Pseudo-Random Number Generator (PRNG)CWE-400Uncontrolled Resource Consumption CWE-770Allocation of Resources Without Limits or Throttling CWE-1241Use of Predictable Algorithm in Random Number Generator

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.

Timeline

Published 2026-03-06

Modified 2026-07-15

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-26018

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Coredns.io Coredns"

All exposed Coredns.io Coredns instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Coredns"

HTTP body or banner mentions "Coredns" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-26018