---
id: "CVE-2026-123575"
page: "https://infrastack.ai/live/CVE-2026-123575"
kind: "vulnerability"
aliases: ["CVE-2026-123575"]
title: "Hickory DNS: incomplete DoH requests exhaust server memory, causing denial of service"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["dns", "hickory-dns", "runtime", "rust", "self-hosted"]
not_affected_if: ["doh-disabled", "hickory-below-0.26.2-not-used"]
published_at: "2026-11-08T02:16:50+00:00"
first_seen_at: "2026-11-08T02:21:12+00:00"
updated_at: "2026-11-08T02:22:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123575", "first_seen_at": "2026-11-08T02:21:12+00:00"}]
exploit_sources: []
---

# Hickory DNS: incomplete DoH requests exhaust server memory, causing denial of service

Link for people: https://infrastack.ai/live/CVE-2026-123575 (this .md is for agents)

Hickory DNS before 0.26.2 does not set enough timeouts or limits on incomplete request bodies in its DNS-over-HTTPS HTTP/2 server. A remote attacker can open many DoH connections and hold them open to exhaust server memory.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Hickory DNS version (for example with `hickory-dns --version` or the version in your Cargo.lock) and see whether it is below `0.26.2`.
- Check whether the DNS-over-HTTPS listener is enabled in your Hickory DNS configuration.

## Fix

- Hickory DNS: move to `0.26.2` or later.

## Timeline

- 2026-11-08T02:21:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123575

## Documents

- [advisory] Vendor advisory: github.com https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g5xf-qv55-wv37
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-doh-memory-exhaustion-via-incomplete-request-bodies

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_