---
id: "CVE-2026-123589"
page: "https://infrastack.ai/live/CVE-2026-123589"
kind: "vulnerability"
aliases: ["CVE-2026-123589"]
title: "hickory-dns: DNS-over-QUIC server holds connections open, causing denial of service"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["dns", "hickory-dns", "hickory-server", "package", "rust", "self-hosted"]
not_affected_if: ["client-only", "doq-disabled", "no-dns-server"]
published_at: "2026-11-08T02:16:52+00:00"
first_seen_at: "2026-11-08T02:21:13+00:00"
updated_at: "2026-11-08T02:24:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123589", "first_seen_at": "2026-11-08T02:21:13+00:00"}]
exploit_sources: []
---

# hickory-dns: DNS-over-QUIC server holds connections open, causing denial of service

Link for people: https://infrastack.ai/live/CVE-2026-123589 (this .md is for agents)

The DNS-over-QUIC server in hickory-server applies no timeout when reading a request from a QUIC stream, so it ignores its configured timeouts. A remote client without credentials can hold a stream open indefinitely, using up server resources and causing a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the `hickory-server` version in your Cargo.lock or dependency tree; affected releases are before `0.26.2`.
- Check whether the DNS-over-QUIC (DoQ) listener is enabled in your hickory-dns configuration.

## Fix

- `hickory-server` `0.26.2`

## Timeline

- 2026-11-08T02:21:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123589

## Documents

- [advisory] Vendor advisory: github.com https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g8wg-4mwh-fjfv
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-denial-of-service-via-missing-dns-over-quic-request-read-timeout

## From the sources

The DNS-over-QUIC (DoQ) server in hickory-server (hickory-dns) before 0.26.2 does not apply any timeout when reading a request message from a QUIC stream, bypassing all configured timeouts. A remote unauthenticated client can open a connection and a request stream and hold it open indefinitely, consuming server resources and causing a denial of service.

---

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