pdns vulnerabilities

UBUNTU-CVE-2026-73206

[A crafted DNS packet can cause a denial of service decompressing the DNS names in the packet]

UBUNTU-CVE-2026-52682

[A crafted DNS packet can cause increased memory and CPU consumption]

Insufficient input validation of internal web server

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.

Incorrect Behaviour of Views with TCP PROXY Requests

Incorrect Behaviour of Views with TCP PROXY Requests

Concurrency and locking defects in GSS-TSIG

Concurrency and locking defects in GSS-TSIG

Insufficient Validation of Autoprimary SOA Queries

Insufficient Validation of Autoprimary SOA Queries

Insufficient Validation of Names During AXFR

Insufficient Validation of Names During AXFR

Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail

Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail

Insufficient validation of HTTPS and SVCB records

An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.

Possible file descriptor exhaustion in forward-dnsupdate

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.

LDAP DN injection

Incomplete escaping of LDAP queries when running with 8bit-dns enabled allows users to perform queries of internal domain subtrees.

Incomplete domain name sanitization during

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.

Insufficient input validation of internal webserver

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.

Insufficient input validation of internal webserver

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.

CVE-2022-27227

In PowerDNS Authoritative Server before 4.4.3, 4.5.x before 4.5.4, and 4.6.x before 4.6.1 and PowerDNS Recursor before 4.4.8, 4.5.x before 4.5.8, and 4.6.x before 4.6.1, insufficient validation of an IXFR end condition causes incomplete zone transfers to be handled as successful transfers.

• Update to 4.1.1-1ubuntu0.1~esm1

CVE-2020-17482

An issue has been found in PowerDNS Authoritative Server before 4.3.1 where an authorized user with the ability to insert crafted records into a zone might be able to leak the content of uninitialized memory.

• Update to 4.1.1-1ubuntu0.1~esm1

CVE-2019-10203

PowerDNS Authoritative daemon , pdns versions 4.0.x before 4.0.9, 4.1.x before 4.1.11, exiting when encountering a serial between 2^31 and 2^32-1 while trying to notify a slave leads to DoS.

CVE-2019-10163

A Vulnerability has been found in PowerDNS Authoritative Server before versions 4.1.9, 4.0.8 allowing a remote, authorized master server to cause a high CPU load or even prevent any further updates to any slave zone by sending a large number of NOTIFY messages. Note that only servers configured as slaves are affected by this issue.

CVE-2019-10162

A vulnerability has been found in PowerDNS Authoritative Server before versions 4.1.10, 4.0.8 allowing an authorized user to cause the server to exit by inserting a crafted record in a MASTER type zone under their control. The issue is due to the fact that the Authoritative Server will exit when it runs into a parsing error while looking up the NS/A/AAAA records it is about to use for an outgoing notify.

CVE-2019-3871

A vulnerability was found in PowerDNS Authoritative Server before 4.0.7 and before 4.1.7. An insufficient validation of data coming from the user when building a HTTP request from a DNS query in the HTTP Connector of the Remote backend, allowing a remote user to cause a denial of service by making the server connect to an invalid endpoint, or possibly information disclosure by making the server connect to an internal endpoint and somehow extracting meaningful information about the response