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CVE-2026-42255

Quick assessment

Affected
Technitium DnsServer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Technitium DNS Server是Technitium团队的一个开源的权威和递归 DNS 服务器。可用于自托管 DNS 服务器以保护隐私和安全。 Technitium DNS Server 15.0之前版本存在安全漏洞，该漏洞源于循环名称服务器委派，可能导致DNS流量放大。

CVSS 7.2 · High EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-42255

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
特定函数功能的不正确供给
Source: CVE Program / CVE List V5
Vulnerability Title
Technitium DNS Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Technitium DNS Server是Technitium团队的一个开源的权威和递归 DNS 服务器。可用于自托管 DNS 服务器以保护隐私和安全。 Technitium DNS Server 15.0之前版本存在安全漏洞，该漏洞源于循环名称服务器委派，可能导致DNS流量放大。
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
Technitium DnsServer 0 ~ 15.0.0 -

II. Public POCs for CVE-2026-42255

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III. Intelligence Information for CVE-2026-42255

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IV. Related Vulnerabilities

Same vendor: Technitium
Same weakness: CWE-684

V. Comments for CVE-2026-42255

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