Powerdns: Security Vulnerabilities
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
0.007
Published
2026-04-22
An attacker can send a notify request that causes a new secondary domain to be added to the bind backend, but causes said backend to update its configuration to an invalid one, leading to the backend no longer able to run on the next restart, requiring manual operation to fix it.
CVSS Score
7.4
EPSS Score
0.004
Published
2026-04-22
Incomplete escaping of LDAP queries when running with 8bit-dns enabled allows users to perform queries of internal domain subtrees.
CVSS Score
5.3
EPSS Score
0.002
Published
2026-04-22
A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.
CVSS Score
5.9
EPSS Score
0.004
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
0.004
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
0.004
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
0.004
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
0.004
Published
2026-04-22
An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
CVSS Score
4.4
EPSS Score
0.005
Published
2026-04-22
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
CVSS Score
4.4
EPSS Score
0.005
Published
2026-04-22