CVE-2025-30187: Powerdns Dnsdist

Low severity, CVSS 3.7. EPSS: 0.3% chance of exploitation in the next 30 days.

In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.

Affected products

• Powerdns Dnsdist: from 1.9.0, before 1.9.11 (fixed in 1.9.11); from 2.0.0, before 2.0.1 (fixed in 2.0.1)

Published 2025-09-18. Last modified 2026-06-17.