Medium severity · published May 19, 2026
CVE-2026-45557
Technitium DNS Server excessive DNSSEC requests
5.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DS
DNS Server · Technitium
before 15.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45557
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45557
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
www.cve.org
https://www.cve.org/CVERecord?id=CVE-2026-45557
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