# CVE-2026-70167: Windows Domain Name Service Remote Code Execution Vulnerability

> An authorized attacker can execute code remotely on Windows DNS Server via a type confusion vulnerability.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 29 Oct 2026
- **Also known as:** GHSA-m7j9-9j6g-vg2m

## What is CVE-2026-70167?

CVE-2026-70167 is a high-severity memory corruption vulnerability in Microsoft Windows Server 2022, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Access of resource using incompatible type ('type confusion') in DNS Server allows an authorized attacker to execute code over a network.

Weakness: CWE-843 (Access of Resource Using Incompatible Type), CWE-822 (Untrusted Pointer Dereference)

## Which versions are affected by CVE-2026-70167?

It affects 2 products.


Products: Microsoft Windows Server 2022, Microsoft Windows Server 2025.

## How do I fix CVE-2026-70167?

No fix has been published for CVE-2026-70167 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-70167 being exploited?

There is no known exploitation of CVE-2026-70167 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows Server 2022

- [CVE-2022-34715](https://insights.sbomify.com/CVE-2022-34715/): Windows Network File System Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2025-50171](https://insights.sbomify.com/CVE-2025-50171/): Remote Desktop Spoofing Vulnerability (critical 9.1)
- [CVE-2026-45648](https://insights.sbomify.com/CVE-2026-45648/): Windows Active Directory Domain Services Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-30064](https://insights.sbomify.com/CVE-2024-30064/): Windows Kernel Elevation of Privilege Vulnerability (high 8.8)
- [CVE-2026-69858](https://insights.sbomify.com/CVE-2026-69858/): Windows DNS Server Remote Code Execution Vulnerability (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-70167 and fix it if it is affected.

What it is: CVE-2026-70167 is a high-severity memory corruption vulnerability in Microsoft Windows Server 2022, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-70167 in the wild and no public exploit code.

Affected product: Microsoft Windows Server 2022. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-70167/ (Markdown: https://insights.sbomify.com/CVE-2026-70167/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70167
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70167
- OSV: https://osv.dev/vulnerability/CVE-2026-70167

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70167/
Summaries are generated and may contain mistakes; the official description above is the record.