Powerdns

By the Year

In 2026 there have been 33 vulnerabilities in Powerdns with an average score of 5.3 out of ten. Last year, in 2025 Powerdns had 3 security vulnerabilities published. That is, 30 more vulnerabilities have already been reported in 2026 as compared to last year. Last year, the average CVE base score was greater by 0.17

Recent Powerdns Security Vulnerabilities

CVE	Date	Vulnerability	Products
CVE-2026-33611	Apr 22, 2026	Invalid HTTPS/SVCB Records Causing LMDB Corruption in Knot DNS 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.	Authoritative
CVE-2026-33610	Apr 22, 2026	PowerDNS Secondary DoS via File Descriptor Exhaustion 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.	Authoritative
CVE-2026-33609	Apr 22, 2026	Incomplete LDAP Escaping in Open-Xchange 8bit-dns Enables Internal Domain Query Incomplete escaping of LDAP queries when running with 8bit-dns enabled allows users to perform queries of internal domain subtrees.	Authoritative
CVE-2026-33608	Apr 22, 2026	CVE-2026-33608: DNS NOTIFY Exploit Causes BIND Config Corruption 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.	Authoritative
CVE-2026-33593	Apr 22, 2026	DNSCrypt CRASH: Divide-by-0 via Crafted DNS Query A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
CVE-2026-33594	Apr 22, 2026	DoH Backend Excessive Mem Alloc via Query Flood 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.
CVE-2026-33595	Apr 22, 2026	Excessive Memory Allocation via DoQ/DoH3 Error Responses in CoreDNS 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.
CVE-2026-33597	Apr 22, 2026	Denial of Service in PRSD Detection (unknown) PRSD detection denial of service
CVE-2026-33596	Apr 22, 2026	DNS Response Mismatch via Timing Flood in DoT/TCP Backends 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.
CVE-2026-33598	Apr 22, 2026	CVE-2026-33598: OOB Read via Cached Lua Response on PacketCache A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache.
CVE-2026-33599	Apr 22, 2026	Rogue Backend Crafts SVCB for DDR auto_upgrade CVE-2026-33599 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.
CVE-2026-33602	Apr 22, 2026	Out-of-Bounds UDP Query ID Off-by-One in DNS Backend Leading to DoS 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.
CVE-2026-33254	Apr 22, 2026	DNSdist Memory Exhaustion DoS via DoQ/DoH3 Connections 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.
CVE-2026-33262	Apr 22, 2026	Null Pointer Deref in Reply Processing Causing DoS An attacker can send replies that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service. Cookies are disabled by default.	Recursor
CVE-2026-33261	Apr 22, 2026	DNSSEC NSECNSEC3 Zone Transition DOS in BIND A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.	Recursor
CVE-2026-33260	Apr 22, 2026	Denial of Service via Unlimited Memory Allocation in 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.	Authoritative Recursor
CVE-2026-33259	Apr 22, 2026	Use-After-Free in ISC BIND RPZ Recursor allowing RPZ data corruption or crash Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.	Recursor
CVE-2026-33258	Apr 22, 2026	Unbound NSEC3 Negative Cache DoS via Crafted Zone By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.	Recursor
CVE-2026-33257	Apr 22, 2026	DoS in Disabled Internal Web Server via Unlimited Memory Allocation 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.	Authoritative Recursor
CVE-2026-33256	Apr 22, 2026	Unlimited Memory Allocation in Internal Web Server Leads to DoS 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.	Recursor
CVE-2026-33601	Apr 22, 2026	DNS DoS: zoneToCache NPD via Malicious Server 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.	Recursor
CVE-2026-33600	Apr 22, 2026	BIND RPZ Null Pointer Deref Causes DoS 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.	Recursor
CVE-2026-27854	Mar 31, 2026	Use-After-Free in DNSdist DNSQuestion:getEDNSOptions via Lua An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.
CVE-2026-27853	Mar 31, 2026	DNSdist OOB Write via DNSResponse:changeName in Lua An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.
CVE-2026-24030	Mar 31, 2026	DNSdist OOM via DNS-over-QUIC/HTTP3 memory exhaustion An attacker might be able to trick DNSdist into allocating too much memory while processing DNS over QUIC or DNS over HTTP/3 payloads, resulting in a denial of service. In setups with a large quantity of memory available this usually results in an exception and the QUIC connection is properly closed, but in some cases the system might enter an out-of-memory state instead and terminate the process.
CVE-2026-24029	Mar 31, 2026	DoH ACL bypass via early_acl_drop Disable in nghttp2-based DoH Server When the early_acl_drop (earlyACLDrop in Lua) option is disabled (default is enabled) on a DNS over HTTPs frontend using the nghttp2 provider, the ACL check is skipped, allowing all clients to send DoH queries regardless of the configured ACL.
CVE-2026-24028	Mar 31, 2026	Out-of-bounds Read via Lua newDNSPacketOverlay in DNS Parser An attacker might be able to trigger an out-of-bounds read by sending a crafted DNS response packet, when custom Lua code uses newDNSPacketOverlay to parse DNS packets. The out-of-bounds read might trigger a crash, leading to a denial of service, or access unrelated memory, leading to potential information disclosure.
CVE-2026-0397	Mar 31, 2026	CORS Misconfig in Internal Webserver Allows Dashboard Info Theft When the internal webserver is enabled (default is disabled), an attacker might be able to trick an administrator logged to the dashboard into visiting a malicious website and extract information about the running configuration from the dashboard. The root cause of the issue is a misconfiguration of the Cross-Origin Resource Sharing (CORS) policy.
CVE-2026-0396	Mar 31, 2026	DNSdist HTML Injection via Crafted DNS Queries An attacker might be able to inject HTML content into the internal web dashboard by sending crafted DNS queries to a DNSdist instance where domain-based dynamic rules have been enabled via either DynBlockRulesGroup:setSuffixMatchRule or DynBlockRulesGroup:setSuffixMatchRuleFFI.
CVE-2025-59024	Feb 09, 2026	Cache Poisoning via Crafted Delegations/IP Fragments in BIND 9 Recursor Crafted delegations or IP fragments can poison cached delegations in Recursor.	Recursor
CVE-2025-59023	Feb 09, 2026	BIND Recursor Cached Delegation Poisoning via Crafted Delegations/IP Fragments Crafted delegations or IP fragments can poison cached delegations in Recursor.	Recursor
CVE-2026-24027	Feb 09, 2026	Zone-based Traffic Injection via Crafted Zones Crafted zones can lead to increased incoming network traffic.	Recursor
CVE-2026-0398	Feb 09, 2026	Recursor Cache Poisoning via Crafted CNAME Chains Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.	Recursor
CVE-2025-59029	Dec 09, 2025	DNS ANY Query Assertion Failure in Caching DNS Server An attacker can trigger an assertion failure by requesting crafted DNS records, waiting for them to be inserted into the records cache, then send a query with qtype set to ANY.	Recursor
CVE-2025-59030	Dec 09, 2025	PostgreSQL: Cache Invalidation via NOTIFY TCP An attacker can trigger the removal of cached records by sending a NOTIFY query over TCP.	Recursor
CVE-2025-30187	Sep 18, 2025	DNSdist nghttp2 DoH I/O Loop DOS Vulnerability 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.
CVE-2023-50387	Feb 14, 2024	DNSSEC KeyTrap DoS via DNSKEY/RRSIG overevaluation in BIND 9 Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.	Recursor
CVE-2023-26437	Apr 04, 2023	DoS in PowerDNS Recursor v4.6.54.8.3: Auth Server Mark Unavailable Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.	Recursor
CVE-2023-22617	Jan 21, 2023	Infinite Recursion in PowerDNS Recursor 4.8.0 via DS Query Fixed in 4.8.1 A remote attacker might be able to cause infinite recursion in PowerDNS Recursor 4.8.0 via a DNS query that retrieves DS records for a misconfigured domain, because QName minimization is used in QM fallback mode. This is fixed in 4.8.1.	Recursor
CVE-2022-37428	Aug 23, 2022	PowerDNS Recursor 4.5.9/4.6.2/4.7.1 Protobuf Logging Crash via DNS Query PowerDNS Recursor up to and including 4.5.9, 4.6.2 and 4.7.1, when protobuf logging is enabled, has Improper Cleanup upon a Thrown Exception, leading to a denial of service (daemon crash) via a DNS query that leads to an answer with specific properties.	Recursor
CVE-2022-27227	Mar 25, 2022	In PowerDNS Authoritative Server before 4.4.3 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.	Authoritative Server Recursor
CVE-2021-36754	Jul 30, 2021	PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes an out-of-bounds exception.	Authoritative Server
CVE-2020-25829	Oct 16, 2020	An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5 An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).	Recursor
CVE-2020-24698	Oct 02, 2020	An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker might be able to cause a double-free, leading to a crash or possibly arbitrary code execution. by sending crafted queries with a GSS-TSIG signature.	Authoritative
CVE-2020-24697	Oct 02, 2020	An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker can cause a denial of service by sending crafted queries with a GSS-TSIG signature.	Authoritative
CVE-2020-24696	Oct 02, 2020	An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker can trigger a race condition leading to a crash, or possibly arbitrary code execution, by sending crafted queries with a GSS-TSIG signature.	Authoritative
CVE-2020-17482	Oct 02, 2020	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. 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.	Authoritative
CVE-2020-14196	Jul 01, 2020	In PowerDNS Recursor versions up to and including 4.3.1 In PowerDNS Recursor versions up to and including 4.3.1, 4.2.2 and 4.1.16, the ACL restricting access to the internal web server is not properly enforced.	Recursor
CVE-2020-10995	May 19, 2020	PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.	Recursor
CVE-2020-10030	May 19, 2020	An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0 An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.	Recursor