Powerdns: >> Dnsdist Security Vulnerabilities
A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.
CVSS Score
3.1
EPSS Score
0.0
Published
2026-04-22
PRSD detection denial of service
CVSS Score
3.7
EPSS Score
0.0
Published
2026-04-22
A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache.
CVSS Score
4.8
EPSS Score
0.0
Published
2026-04-22
A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.
CVSS Score
3.1
EPSS Score
0.0
Published
2026-04-22
A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.
CVSS Score
6.5
EPSS Score
0.0
Published
2026-04-22
An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-22
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-04-22
A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-22
A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-22
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-22
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