---
id: CVE-2026-123575
title: Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies
summary: >-
  Hickory DNS before 0.26.2 contains a resource exhaustion vulnerability in its
  DNS-over-HTTPS HTTP/2 server that lacks sufficient timeouts or limits for
  incomplete request bodies. Remote attackers can open DoH connections, send
  incomplete…
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 < 0.26.2
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:11.288Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123575'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g5xf-qv55-wv37
    label: GitHub Security Advisory (GHSA-g5xf-qv55-wv37)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-doh-memory-exhaustion-via-incomplete-request-bodies
    label: >-
      VulnCheck Advisory: Hickory DNS before 0.26.2 DoH Memory Exhaustion via
      Incomplete Request Bodies
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.655Z'
---

## Overview

Hickory DNS before 0.26.2 contains a resource exhaustion vulnerability in its DNS-over-HTTPS HTTP/2 server that lacks sufficient timeouts or limits for incomplete request bodies. Remote attackers can open DoH connections, send incomplete request bodies, and hold connections open to exhaust server memory.

## Affected

- `hickory-dns < 0.26.2`

## Remediation

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