---
id: CVE-2026-123584
title: >-
  Hickory-DNS 0.26.0 before 0.26.2 UDP Client Denial of Service via Spoofed
  Responses
summary: >-
  The hickory-net crate in Hickory DNS 0.26.0 before 0.26.2 stops listening and
  returns an error when a client UDP connection receives a datagram that cannot
  be parsed as a DNS message. Remote attackers who guess the query's source
  port, w…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-696
vendor: hickory-dns
product: hickory-dns
affected:
  - hickory-dns >= 0.26.0 < 0.26.2
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:17.587Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123584'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-v44v-c8m4-gc43
    label: GitHub Security Advisory (GHSA-v44v-c8m4-gc43)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-0.26.0-before-0.26.2-udp-client-denial-of-service-via-spoofed-responses
    label: >-
      VulnCheck Advisory: Hickory-DNS 0.26.0 before 0.26.2 UDP Client Denial of
      Service via Spoofed Responses
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.651Z'
---

## Overview

The hickory-net crate in Hickory DNS 0.26.0 before 0.26.2 stops listening and returns an error when a client UDP connection receives a datagram that cannot be parsed as a DNS message. Remote attackers who guess the query's source port, without knowing the transaction ID, can spoof malformed responses to abort client queries, causing denial of service.

## Affected

- `hickory-dns >= 0.26.0 < 0.26.2`

## Remediation

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