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CVE-2026-66374

Quick assessment

Affected
nic Knot Resolver
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.

nic Knot Resolver是nic组织开源的一款缓存DNS解析器。 nic Knot Resolver 6.4.1之前版本存在输入验证错误漏洞，该漏洞源于DoQ接收路径存在堆缓冲区溢出，允许远程代码执行。

CVSS 8.1 · High EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
nic Knot Resolver < 6.4.1 affected
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I. Basic Information for CVE-2026-66374

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
nic Knot Resolver 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nic Knot Resolver是nic组织开源的一款缓存DNS解析器。 nic Knot Resolver 6.4.1之前版本存在输入验证错误漏洞，该漏洞源于DoQ接收路径存在堆缓冲区溢出，允许远程代码执行。
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
nic Knot Resolver 0 ~ 6.4.1 -

II. Public POCs for CVE-2026-66374

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 15580 chars
Pro+ exclusive includes:
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-2026-66374

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Exploits & Public PoCs for CVE-2026-66374 (1)

Mailing List Discussions for CVE-2026-66374 (1)

IV. Related Vulnerabilities

Same vendor: nic
Same weakness: CWE-1284

V. Comments for CVE-2026-66374

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