---
id: CVE-2026-123589
title: >-
  Hickory DNS before 0.26.2 Denial of Service via Missing DNS-over-QUIC Request
  Read Timeout
summary: >-
  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
  conn…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
vendor: hickory-dns
product: hickory-dns
affected:
  - hickory-dns < 0.26.2
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:20.968Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123589'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g8wg-4mwh-fjfv
    label: GitHub Security Advisory (GHSA-g8wg-4mwh-fjfv)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-denial-of-service-via-missing-dns-over-quic-request-read-timeout
    label: >-
      VulnCheck Advisory: Hickory DNS before 0.26.2 Denial of Service via
      Missing DNS-over-QUIC Request Read Timeout
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.648Z'
---

## Overview

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.

## Affected

- `hickory-dns < 0.26.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.