DNS Traffic Amplification Vulnerability in Technitium DNS Server
CVE-2026-42255

7.2HIGH

Key Information:

Vendor

Technitium

Status
Dnsserver
Vendor
CVE Published:
26 April 2026

What is CVE-2026-42255?

The Technitium DNS Server is susceptible to a vulnerability that allows attackers to exploit cyclic name server delegation, leading to DNS traffic amplification. This can result in increased bandwidth usage and potential denial of service, jeopardizing the server's performance and reliability.

Affected Version(s)

DnsServer 0 < 15.0.0

References

https://github.com/TechnitiumSoftware/DnsServer/blob/mast...

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.