UBUNTU-CVE-2026-52682
[A crafted DNS packet can cause increased memory and CPU consumption]
Publicación Actualización
PatchFirst · Vulnerabilidades recientes
Vulnerabilidades de dnsdist
Vulnerabilidades publicadas para dnsdist en los últimos 30 días: 0. Incluidas en el catálogo KEV: 0.
Vulnerabilidades: 31
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.
Publicación ActualizaciónDenial 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.
Publicación ActualizaciónOut-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.
Publicación ActualizaciónDenial 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.
Publicación ActualizaciónDenial 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.
Publicación ActualizaciónPrometheus 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.
Publicación ActualizaciónInsufficient 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.
Publicación ActualizaciónDenial of service via crafted DNSCrypt query
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
Publicación ActualizaciónOutgoing DoH excessive memory allocation
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.
Publicación ActualizaciónDoQ/DoH3 excessive memory allocation
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.
Publicación ActualizaciónPRSD detection denial of service
PRSD detection denial of service
Publicación ActualizaciónTCP backend stream ID overflow
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.
Publicación ActualizaciónOut-of-bounds read in cache inspection via Lua
A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache.
Publicación ActualizaciónOut-of-bounds read in service discovery
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.
Publicación ActualizaciónOff-by-one access when processing crafted UDP responses
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.
Publicación ActualizaciónResource exhaustion 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.
Publicación ActualizaciónInsufficient input validation of internal webserver
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.
Publicación ActualizaciónInsufficient input validation of internal webserver
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.
Publicación ActualizaciónUse after free when parsing EDNS options in 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.
Publicación Actualización
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