Description
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.
Scores
CVSS v3
3.7
EPSS
0.0001
EPSS Percentile
1.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-835
Status
published
Products (2)
PowerDNS/DNSdist
1.9.0 - 1.9.11
PowerDNS/DNSdist
2.0.0 - 2.0.1
Published
Sep 18, 2025
Tracked Since
Feb 18, 2026