Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute

Stack-based buffer overflow

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

Do this now

Restrict network access to Windows Netlogon and watch for a vendor fix.

First seen: 23 Oct 2026
Last update: 23 Oct 2026, 22:17 UTC
Identifiers: CVE-2026-41089
CVSS: 9.8
Source: news
On the menu as: Windows

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute
Severity: critical. Patch status: fix status unknown.
Affected: Stack-based buffer overflow
Ids: CVE-2026-41089

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

## Steps
1. This touches infrastructure (windows). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. There is no fix yet. Until one ships: Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-41089") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089 https://nvd.nist.gov/vuln/detail/CVE-2026-41089
https://pwned.coffee/i/stack-based-buffer-overflow-in-windows-netlogon-allows-a-cve-2026-41089

Timeline

23 Oct 2026, 22:17 UTC
Proof-of-concept code for CVE-2026-41089 is public on GitHub. Unverified, but expect scanning to follow.
23 Oct 2026
First reported.

Sources

Totalone very hot coffee