DeutschShown in its original language — a full translation is planned for a future version.
DNSdist: Mehrere Schwachstellen ermöglichen Denial of Service
view advisory published 2026-04-21
Ein Angreifer kann mehrere Schwachstellen in DNSdist ausnutzen, um einen Denial of Service Angriff durchzuführen.
01
describes (11)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33602US | high8.2 | — | ||
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-2026-33599US | high8.1 | — | ||
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… | ||||
| CVE-2026-33598US | critical9.1 | — | ||
A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache. | ||||
| CVE-2026-33597US | high7.5 | — | ||
PRSD detection denial of service | ||||
| CVE-2026-33596US | medium6.5 | — | ||
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… | ||||
| CVE-2026-33595US | high7.5 | — | ||
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 t… | ||||
| CVE-2026-33594US | high7.5 | — | ||
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… | ||||
| CVE-2026-33593US | — | — | ||
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query. | ||||
| CVE-2026-33254US | high7.5 | — | ||
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 dis… | ||||
| CVE-2026-33260US | high7.5 | — | ||
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 defaul… | ||||
| CVE-2026-33257US | high7.5 | — | ||
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 defaul… | ||||
02
references
External citations — patches, advisories, analysis.
- PowerDNS Security Advisory 2026-04 for PowerDNS DNSdist vom 2026-04-21external
- Fedora Security Advisory FEDORA-EPEL-2026-64C1CC86C1 vom 2026-06-06external
- cPanel & WHM Change Logexternal
- Debian Security Advisory DSA-6235 vom 2026-04-29external
- openSUSE Security Update OPENSUSE-SU-2026:10632-1 vom 2026-04-29external
- SUSE Security Update SUSE-SU-2026:22319-1 vom 2026-07-01external
- WID-SEC-W-2026-1230 - CSAF Versionself
- WID-SEC-2026-1230 - Portal Versionself
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