CVE-2026-52684

Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack

If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS records.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-52686

Wildcard CNAME proof validation bypass

The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-52688

RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-40211

Denial of service via crafted DoH3 queries

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-42005

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Authoritative

CVE-2026-42388

Missing input validation for catalog zones

Incomplete validation of the SOA record present in a catalog zone might lead to a crash.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-40208

Denial of service via DoH3 queries

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-40210

Out-of-bounds read in SetMacAddrAction

An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-42004

EDNS options smuggling

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-52690

Spoofed answers can mark an authoritative non-EDNS capable

Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdiation of DNSSEC records served by that server to fail.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-42389

Reject more queries with invalid header values

This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-40011

Prometheus denial of service via crafted DNS queries

An attacker sending a large number of crafted DNS queries might be able to trigger a dynamic block being inserted with a value causing invalid output to be produced in the prometheus endpoint. The prometheus endpoint will then be rejected by the scraper until the dynamic block expires.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-40209

Denial of service via IXFR queries

An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Dnsdist

CVE-2026-33612

ZoneToCache can poison the cache

A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache poisoning.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-40012

Information about ECS zero scoped answers might leak to clients that use a specific ECS

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-42387

Insufficient input validation in ZoneToCache

A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-42390

ZONEMD validation can be bypassed

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Recursor

CVE-2026-41999

Incorrect Behaviour of Views with TCP PROXY Requests

Incorrect Behaviour of Views with TCP PROXY Requests

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Authoritative

CVE-2026-42000

Insufficient Validation of Names During AXFR

Insufficient Validation of Names During AXFR

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Authoritative

CVE-2026-42001

Insufficient Validation of Autoprimary SOA Queries

Insufficient Validation of Autoprimary SOA Queries

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Powerdns

Products

Authoritative