---
id: "CVE-2026-96064"
page: "https://infrastack.ai/live/CVE-2026-96064"
kind: "vulnerability"
aliases: ["CVE-2026-96064"]
title: "Windows DNS Server heap overflow lets an authenticated user run code over the network"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Server 2016", "fixed": ["10.0.14393.9688"], "affected": ">= 10.0.14393.0, < 10.0.14393.9688", "ecosystem": "vendor"}, {"name": "Windows Server 2019", "fixed": ["10.0.17763.9487"], "affected": ">= 10.0.17763.0, < 10.0.17763.9487", "ecosystem": "vendor"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": ">= 10.0.20348.0, < 10.0.20348.5870", "ecosystem": "vendor"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": ">= 10.0.26100.0, < 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: []
tags: ["active-directory", "dns", "infrastructure", "windows", "windows-server"]
not_affected_if: ["no-dns-role", "no-dns-server-role", "patched", "third-party-dns-software"]
published_at: "2026-11-10T19:22:04+00:00"
first_seen_at: "2026-11-10T19:25:29+00:00"
updated_at: "2026-11-10T19:57:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96064", "first_seen_at": "2026-11-10T19:25:29+00:00"}, {"source": "analyst", "url": "https://cveawg.mitre.org/api/cve/CVE-2026-96064", "first_seen_at": "2026-11-10T19:57:12+00:00", "cites": ["https://cveawg.mitre.org/api/cve/CVE-2026-96064"]}]
exploit_sources: []
---

# Windows DNS Server heap overflow lets an authenticated user run code over the network

Link for people: https://infrastack.ai/live/CVE-2026-96064 (this .md is for agents)

A heap-based buffer overflow in Microsoft's DNS Server lets an attacker who already has authorized access send crafted input over the network. A successful attack lets them execute code on the server.

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

## Affected

- vendor:Windows Server 2016 affected >= 10.0.14393.0, < 10.0.14393.9688 fixed 10.0.14393.9688
- vendor:Windows Server 2019 affected >= 10.0.17763.0, < 10.0.17763.9487 fixed 10.0.17763.9487
- vendor:Windows Server 2022 affected >= 10.0.20348.0, < 10.0.20348.5870 fixed 10.0.20348.5870
- vendor:Windows Server 2025 affected >= 10.0.26100.0, < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

On each Windows Server, check if the DNS Server role is installed (Get-WindowsFeature DNS). If so, check the build (winver, or [System.Environment]::OSVersion.Version) and compare with the fixed builds: 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33822. Lower means vulnerable. Check Server Core installs too.

## Fix

Install the November 2026 Windows security update: Server 2016 build 10.0.14393.9688 or later, Server 2019 10.0.17763.9487 or later, Server 2022 10.0.20348.5870 or later, Server 2025 10.0.26100.33822 or later. KB numbers not confirmed.

## Timeline

- 2026-11-10T19:25:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-96064
- 2026-11-10T19:57:12+00:00 analyst https://cveawg.mitre.org/api/cve/CVE-2026-96064 — Read Microsoft's CNA CVE record (MSRC page is JS-only, not read directly): affected/fixed builds for Server 2016/2019/2022/2025. No KB numbers, no exploitation or PoC info found; sibling CVE-2026-96113 is a different unauthenticated bug.

## Documents

- [advisory] CVE-2026-96064 CVE record published by Microsoft (CNA) https://cveawg.mitre.org/api/cve/CVE-2026-96064

## From the sources

Heap-based buffer overflow in DNS Server allows an authorized 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_