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CVE-2026-26018— CoreDNS Loop Detection Denial of Service Vulnerability

Quick assessment

Affected
coredns coredns
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.14.2之前版本存在安全漏洞，该漏洞源于循环检测插件存在拒绝服务漏洞，可能导致DNS服务器崩溃。

CVSS 7.5 · High EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns < 1.14.2 affected
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I. Basic Information for CVE-2026-26018

Vulnerability Information
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Vulnerability Title
CoreDNS Loop Detection Denial of Service Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
PRNG中使用可预测种子
Source: CVE Program / CVE List V5
Vulnerability Title
CoreDNS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.14.2之前版本存在安全漏洞，该漏洞源于循环检测插件存在拒绝服务漏洞，可能导致DNS服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coredns coredns < 1.14.2 -

II. Public POCs for CVE-2026-26018

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6597 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-26018

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Vendor Advisories for CVE-2026-26018 (1)

Vendor Pages for CVE-2026-26018 (1)

IV. Related Vulnerabilities

Same product: coredns
Same vendor: coredns
Same weakness: CWE-337

V. Comments for CVE-2026-26018

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