CVE-2026-45557 Technitium DNS Server excessive DNSSEC requests
An attacker controlling a domain can cause excessive network traffic and resource exhaustion in Technitium DNS Server by triggering aggressive DNSSEC record fetches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45557?
CVE-2026-45557 is a medium-severity denial of service vulnerability in Technitium DNS Server, published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-45557?
How do I fix CVE-2026-45557?
No fix has been published for CVE-2026-45557 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-45557 being exploited?
There is no known exploitation of CVE-2026-45557 in the wild and no public exploit code.
Sources
Also known as GHSA-vpfg-gc96-vg45.