---
id: CVE-2026-123573
title: hickory-dns from 0.20.1 before 0.26.2 Panic in SVCB/HTTPS Zone File Parser
summary: >-
  hickory-dns from 0.20.1 before 0.26.2 contains a denial of service
  vulnerability in the hickory-proto SVCB and HTTPS record presentation format
  parser. Attackers can supply untrusted zone files where only a single or
  double quote replace…
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-20
vendor: hickory-dns
product: hickory-dns
affected:
  - hickory-dns >= 0.20.1 < 0.26.2
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:38:09.961Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123573'
references:
  - url: >-
      https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-wgfr-mphw-j5g4
    label: GitHub Security Advisory (GHSA-wgfr-mphw-j5g4)
  - url: >-
      https://www.vulncheck.com/advisories/hickory-dns-from-0.20.1-before-0.26.2-panic-in-svcb-https-zone-file-parser
    label: >-
      VulnCheck Advisory: hickory-dns from 0.20.1 before 0.26.2 Panic in
      SVCB/HTTPS Zone File Parser
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.656Z'
---

## Overview

hickory-dns from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation format parser. Attackers can supply untrusted zone files where only a single or double quote replaces a service parameter value, triggering a panic that crashes the parsing process.

## Affected

- `hickory-dns >= 0.20.1 < 0.26.2`

## Remediation

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