This page lists publicly disclosed CVE vulnerabilities affecting powerdns dnsdist (linked via NVD CPE). Each row includes severity scores, summaries, and publication dates to help identify and analyze security issues.
| CVE | Summary | Source | Max CVSS | EPSS % | Published | Updated |
|---|---|---|---|---|---|---|
| CVE-2026-33602 | 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. | [email protected] | 6.5 | 0.73% | 2026-04-22 | 2026-06-17 |
| 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. | [email protected] | 3.1 | 0.28% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33598 | A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache. | [email protected] | 4.8 | 1.07% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33597 | PRSD detection denial of service | [email protected] | 3.7 | 0.35% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33596 | 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. | [email protected] | 3.1 | 0.17% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33595 | 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. | [email protected] | 5.3 | 0.37% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33594 | 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. | [email protected] | 5.3 | 0.37% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33593 | A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query. | [email protected] | 7.5 | 0.38% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33254 | 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. | [email protected] | 5.3 | 0.37% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33260 | 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. | [email protected] | 5.3 | 0.52% | 2026-04-22 | 2026-06-17 |
| CVE-2026-33257 | 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. | [email protected] | 5.3 | 0.51% | 2026-04-22 | 2026-06-17 |
| CVE-2026-27854 | 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. | [email protected] | 4.8 | 0.47% | 2026-03-31 | 2026-06-17 |
| CVE-2026-27853 | 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. | [email protected] | 5.9 | 0.49% | 2026-03-31 | 2026-06-17 |
| CVE-2026-24030 | 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. | [email protected] | 5.3 | 0.54% | 2026-03-31 | 2026-06-17 |
| CVE-2026-24029 | 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. | [email protected] | 6.5 | 0.15% | 2026-03-31 | 2026-06-17 |
| CVE-2026-24028 | 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. | [email protected] | 5.3 | 1.03% | 2026-03-31 | 2026-06-17 |
| CVE-2026-0397 | 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. | [email protected] | 3.1 | 0.16% | 2026-03-31 | 2026-06-17 |
| CVE-2026-0396 | 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. | [email protected] | 3.1 | 0.14% | 2026-03-31 | 2026-06-17 |
| CVE-2018-14663 | An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing data such that the addition of a record by dnsdist, for example an OPT record when adding EDNS Client Subnet, might result in the trailing data being smuggled to the backend as a valid record while not seen by dnsdist. This is an issue when dnsdist is deployed as a DNS Firewall and used to filter some records that should not be received by the backend. This issue occurs only whe | [email protected] | 5.9 | 2.57% | 2018-11-26 | 2026-06-16 |
| CVE-2016-7069 | An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash. | [email protected] | 5.9 | 4.58% | 2018-09-11 | 2026-06-16 |