---
id: CVE-2026-123576
title: Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC Requests
summary: >-
  Hickory DNS 0.24.0 through 0.26.1 contains a memory exhaustion vulnerability
  that allows remote attackers to consume server resources by sending incomplete
  DNS-over-QUIC request bodies. Attackers can open many connections and send
  only l…
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 <= 0.26.1
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:11.970Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123576'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-2f4m-fq7w-mrgx
    label: GitHub Security Advisory (GHSA-2f4m-fq7w-mrgx)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-0.24.0-through-0.26.1-memory-exhaustion-via-dns-over-quic-requests
    label: >-
      VulnCheck Advisory: Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion
      via DNS-over-QUIC Requests
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.658Z'
---

## Overview

Hickory DNS 0.24.0 through 0.26.1 contains a memory exhaustion vulnerability that allows remote attackers to consume server resources by sending incomplete DNS-over-QUIC request bodies. Attackers can open many connections and send only large length prefixes, causing pre-allocated buffers to persist without timeout and exhausting server memory.

## Affected

- `hickory-dns >= 0.24.0 <= 0.26.1`

## Remediation

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