---
id: CVE-2026-123577
title: Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
summary: >-
  Hickory DNS from 0.24.0 before 0.26.2 contains a resource exhaustion
  vulnerability that allows remote attackers to consume server memory via
  unbounded DoH request bodies. Attackers can send large request bodies over
  HTTP/2 or HTTP/3 to a…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-770
vendor: hickory-dns
product: hickory-dns
affected:
  - hickory-dns >= 0.24.0 < 0.26.2
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:12.696Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123577'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-5r56-v84h-c3w5
    label: GitHub Security Advisory (GHSA-5r56-v84h-c3w5)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-0.24.0-before-0.26.2-doh-unbounded-request-body-denial-of-service
    label: >-
      VulnCheck Advisory: Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request
      Body Denial of Service
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.654Z'
---

## Overview

Hickory DNS from 0.24.0 before 0.26.2 contains a resource exhaustion vulnerability that allows remote attackers to consume server memory via unbounded DoH request bodies. Attackers can send large request bodies over HTTP/2 or HTTP/3 to a DNS over HTTP server, causing memory exhaustion and denial of service.

## Affected

- `hickory-dns >= 0.24.0 < 0.26.2`

## Remediation

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