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28 vulnerabilities found for DNSdist by PowerDNS
CVE-2026-42004 (GCVE-0-2026-42004)
Vulnerability from cvelistv5
Published
2026-06-25 12:24
Modified
2026-06-25 13:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Misinterpretation of Input
Summary
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.
References
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CVE-2026-40211 (GCVE-0-2026-40211)
Vulnerability from cvelistv5
Published
2026-06-25 12:23
Modified
2026-06-25 13:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
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CVE-2026-40210 (GCVE-0-2026-40210)
Vulnerability from cvelistv5
Published
2026-06-25 12:23
Modified
2026-06-25 13:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Buffer Over-read
Summary
An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.
References
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CVE-2026-40209 (GCVE-0-2026-40209)
Vulnerability from cvelistv5
Published
2026-06-25 12:23
Modified
2026-06-25 13:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Missing Release of Resource after Effective Lifetime
Summary
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.
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CVE-2026-40208 (GCVE-0-2026-40208)
Vulnerability from cvelistv5
Published
2026-06-25 12:22
Modified
2026-06-25 13:24
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Incorrect Control Flow Scoping
Summary
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
References
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CVE-2026-40011 (GCVE-0-2026-40011)
Vulnerability from cvelistv5
Published
2026-06-25 12:22
Modified
2026-06-25 13:23
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Improper Encoding or Escaping of Output
Summary
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.
References
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CVE-2026-33593 (GCVE-0-2026-33593)
Vulnerability from cvelistv5
Published
2026-04-22 13:48
Modified
2026-04-22 14:29
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Divide By Zero
Summary
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
References
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CVE-2026-33594 (GCVE-0-2026-33594)
Vulnerability from cvelistv5
Published
2026-04-22 13:48
Modified
2026-04-22 14:36
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
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CVE-2026-33595 (GCVE-0-2026-33595)
Vulnerability from cvelistv5
Published
2026-04-22 13:47
Modified
2026-04-22 14:40
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
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CVE-2026-33597 (GCVE-0-2026-33597)
Vulnerability from cvelistv5
Published
2026-04-22 13:47
Modified
2026-04-22 14:41
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Improper Encoding or Escaping of Output
Summary
PRSD detection denial of service
References
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CVE-2026-33596 (GCVE-0-2026-33596)
Vulnerability from cvelistv5
Published
2026-04-22 13:47
Modified
2026-04-22 14:43
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Integer Overflow or Wraparound
Summary
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.
References
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CVE-2026-33598 (GCVE-0-2026-33598)
Vulnerability from cvelistv5
Published
2026-04-22 13:46
Modified
2026-04-22 14:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Out-of-bounds Read
Summary
A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache.
References
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CVE-2026-33599 (GCVE-0-2026-33599)
Vulnerability from cvelistv5
Published
2026-04-22 13:46
Modified
2026-04-22 14:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Out-of-bounds Read
Summary
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.
References
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CVE-2026-33602 (GCVE-0-2026-33602)
Vulnerability from cvelistv5
Published
2026-04-22 13:45
Modified
2026-04-22 14:47
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Heap-based Buffer Overflow
Summary
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.
References
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CVE-2026-33254 (GCVE-0-2026-33254)
Vulnerability from cvelistv5
Published
2026-04-22 13:45
Modified
2026-04-22 14:51
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
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CVE-2026-33260 (GCVE-0-2026-33260)
Vulnerability from cvelistv5
Published
2026-04-22 09:39
Modified
2026-04-22 18:10
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
Impacted products
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CVE-2026-33257 (GCVE-0-2026-33257)
Vulnerability from cvelistv5
Published
2026-04-22 09:37
Modified
2026-04-22 18:10
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Allocation of Resources Without Limits or Throttling
Summary
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.
References
Impacted products
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CVE-2026-27854 (GCVE-0-2026-27854)
Vulnerability from cvelistv5
Published
2026-03-31 12:06
Modified
2026-04-02 13:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Use After Free
Summary
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.
References
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CVE-2026-27853 (GCVE-0-2026-27853)
Vulnerability from cvelistv5
Published
2026-03-31 12:04
Modified
2026-03-31 13:17
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Out-of-bounds Write
Summary
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.
References
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CVE-2026-24030 (GCVE-0-2026-24030)
Vulnerability from cvelistv5
Published
2026-03-31 12:01
Modified
2026-03-31 13:14
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Uncontrolled Memory Allocation
Summary
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.
References
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CVE-2026-24029 (GCVE-0-2026-24029)
Vulnerability from cvelistv5
Published
2026-03-31 11:59
Modified
2026-03-31 13:15
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Incorrect Authorization
Summary
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.
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CVE-2026-24028 (GCVE-0-2026-24028)
Vulnerability from cvelistv5
Published
2026-03-31 11:57
Modified
2026-03-31 13:18
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Buffer Over-read
Summary
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.
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CVE-2026-0397 (GCVE-0-2026-0397)
Vulnerability from cvelistv5
Published
2026-03-31 11:53
Modified
2026-03-31 13:20
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Overly Permissive Cross-domain Whitelist
Summary
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.
References
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CVE-2026-0396 (GCVE-0-2026-0396)
Vulnerability from cvelistv5
Published
2026-03-31 11:50
Modified
2026-03-31 13:21
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Summary
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.
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CVE-2025-30187 (GCVE-0-2025-30187)
Vulnerability from cvelistv5
Published
2025-09-18 09:21
Modified
2025-11-04 21:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Summary
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.
References
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CVE-2025-30193 (GCVE-0-2025-30193)
Vulnerability from cvelistv5
Published
2025-05-20 11:17
Modified
2025-05-20 13:16
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-674 - Uncontrolled Recursion
Summary
In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.
The remedy is: upgrade to the patched 1.9.10 version.
A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.
We would like to thank Renaud Allard for bringing this issue to our attention.
References
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CVE-2025-30194 (GCVE-0-2025-30194)
Vulnerability from cvelistv5
Published
2025-04-29 11:25
Modified
2025-06-20 15:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - User After Free
Summary
When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service.
The remedy is: upgrade to the patched 1.9.9 version.
A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version.
We would like to thank Charles Howes for bringing this issue to our attention.
References
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CVE-2024-25581 (GCVE-0-2024-25581)
Vulnerability from cvelistv5
Published
2024-05-13 11:49
Modified
2025-02-13 17:40
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-20 - Improper Input Validation
Summary
When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.
References
Impacted products
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"datePublic": "2024-05-13T10:00:00.000Z",
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"value": "\u003cp\u003eWhen incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.\u003c/p\u003e"
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"value": "When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default."
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],
"impacts": [
{
"capecId": "CAPEC-212",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-212 Functionality Misuse"
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]
}
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
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"description": "CWE-20 Improper Input Validation",
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"providerMetadata": {
"dateUpdated": "2024-06-10T17:12:42.212Z",
"orgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981",
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"references": [
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"url": "https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2024-03.html"
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{
"url": "http://www.openwall.com/lists/oss-security/2024/05/13/1"
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"source": {
"advisory": "PowerDNS Security Advisory 2024-03",
"discovery": "EXTERNAL"
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"title": "Transfer requests received over DoH can lead to a denial of service in DNSdist",
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"value": "\u003cp\u003eOption 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library=\u0027h2o\u0027 in the addDOHLocal directive\u003c/p\u003e"
}
],
"value": "Option 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library=\u0027h2o\u0027 in the addDOHLocal directive"
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"cveId": "CVE-2024-25581",
"datePublished": "2024-05-13T11:49:24.500Z",
"dateReserved": "2024-02-08T08:15:37.204Z",
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