The vulnerability of the handleReadableStream() function in the file pdns/dnsdistdist/doq.cc, and the processH3DataEvent() function in the file pdns/dnsdistdist/doh3.cc, both from the DNS load balancer and proxy for DNS traffic, allows a attacker to cause a service failure.

The vulnerability of the handleReadableStream function in the pdns/dnsdistdist/doq.cc file and the processH3DataEvent function in the pdns/dnsdistdist/doh3.cc file, both from the DNS load balancer and proxy components, is related to uncontrolled memory allocation. Exploiting this vulnerability...

OESA-2026-3442 coredns security update

CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fixes: CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport...

OESA-2026-3371 coredns security update

CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fixes: CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport...

OESA-2026-3370 coredns security update

CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fixes: CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport...

OESA-2026-3369 coredns security update

CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fixes: CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport...

OESA-2026-3368 coredns security update

CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fixes: CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport...

SUSE-SU-2026:23123-1 Security update for dnsdist

This update for dnsdist fixes the following issues: Update to 1.9.15. Changes for dnsdist: - https://www.dnsdist.org/changelog.htmlchange-1.9.15 - https://www.dnsdist.org/changelog.htmlchange-1.9.14 Security issues fixed: - CVE-2026-40011: invalid output produced in the prometheus endpoint when a...

PT-2026-93904

Name of the Vulnerable Software and Affected Versions CoreDNS versions prior to 1.14.7 Description CoreDNS fails to apply the dns.DefaultMsgAcceptFunc request policy when processing requests via DNS-over-HTTPS DoH, DNS-over-HTTP/3 DoH3, DNS-over-QUIC DoQ, and DNS-over-gRPC listeners. Specifically...

CVE-2026-40208: Incorrect Control Flow Scoping

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame...

DNSdist -- vulnerabilities

The DNSdist team reports: CVE-2026-40011: Prometheus denial of service via crafted DNS queries CVE-2026-42004: EDNS options smuggling CVE-2026-42005: Insufficient input validation of internal web server CVE-2026-40208: Denial of service via DoH3 queries CVE-2026-40209: Denial of service via IXFR...

CVE-2026-35579

CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport implementations incorrectly handle TSIG authentication. For gRPC and QUIC, the server checks whether the TSIG key name exists in the configuration but never calls dns.TsigVerify to validate...

CVE-2026-33190

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports DoT, DoH, DoH3, DoQ, and gRPC because it trusts the transport writer's TsigStatus instead of performing verification itself. The DoH and DoH3 writer's TsigStatus...

CVE-2026-35579: Improper Authentication

CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport implementations incorrectly handle TSIG authentication. For gRPC and QUIC, the server checks whether the TSIG key name exists in the configuration but never calls dns.TsigVerify to validate...

CVE-2026-33190: Incorrect Implementation of Authentication Algorithm

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports DoT, DoH, DoH3, DoQ, and gRPC because it trusts the transport writer's TsigStatus instead of performing verification itself. The DoH and DoH3 writer's TsigStatus...

CVE-2026-33254: Allocation of Resources Without Limits or Throttling

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-2026-33595: Allocation of Resources Without Limits or Throttling

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...