---
id: "CVE-2026-88218"
page: "https://infrastack.ai/live/CVE-2026-88218"
kind: "vulnerability"
aliases: ["CVE-2026-88218"]
title: "Windows DNS: double free lets unauthenticated network attacker run code"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["dns-server", "network-reachable", "runtime", "windows", "windows-server"]
not_affected_if: []
published_at: "2026-11-10T19:21:28+00:00"
first_seen_at: "2026-11-10T19:25:19+00:00"
updated_at: "2026-11-10T19:30:09+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88218", "first_seen_at": "2026-11-10T19:25:19+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-10T19:30:09+00:00"}]
exploit_sources: []
---

# Windows DNS: double free lets unauthenticated network attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-88218 (this .md is for agents)

A double free bug in the Windows DNS server lets an unauthorized attacker send crafted requests over the network. A successful attack can execute code on the affected server.

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

## How to check

Unconfirmed: on each Windows Server run 'Get-WindowsFeature DNS' (Installed = yes means the DNS Server role is present, and domain controllers often run it). Then compare the installed cumulative update against the November 2026 MSRC entry for CVE-2026-88218 once it lists KBs.

## Timeline

- 2026-11-10T19:25:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-88218
- 2026-11-10T19:30:09+00:00 analyst — Patch Tuesday 2026-11-10 CVE; MSRC page is JS-only and the CVRF 2026-Nov feed is not up yet, so no Microsoft advisory, KB or affected-version list was readable. Searches found no write-ups or PoC (similar August DNS CVEs are different ids). Nothing verified. Revisit when MSRC publishes.

## From the sources

Double free in Windows DNS allows an unauthorized attacker to execute code over a network.

---

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