CVE-2026-45557

MEDIUM 5.8

Technitium DNS Server excessive DNSSEC requests

CVSS Score

5.8

EPSS Score

0.0%

EPSS Percentile

0th

Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0.

CWE	CWE-405 CWE-406 CWE-770
Vendor	technitium
Product	dns server
Published	May 19, 2026
Last Updated	May 19, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

Technitium / DNS Server

0 < 15.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md#version-150 raw.githubusercontent.com: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json cve.org: https://www.cve.org/CVERecord?id=CVE-2026-45557

Credits

Shuhan Zhang, Tsinghua University Dan Li, Tsinghua University Baojun Liu, Tsinghua University