# CVE-2026-61920: Windows DNS Server Remote Code Execution Vulnerability

> An authorized attacker can execute code remotely on Windows DNS Server due to a race condition in shared resource handling.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-q7cm-j53p-gvff

## What is CVE-2026-61920?

CVE-2026-61920 is a medium-severity vulnerability in Microsoft Windows 10 1607, published on 11 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an authorized attacker to execute code over a network.

Weakness: CWE-416 (Use After Free), CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2026-61920?

It affects 8 products.


Products: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 11 26h1, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.

## How do I fix CVE-2026-61920?

No fix has been published for CVE-2026-61920 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-61920 being exploited?

There is no known exploitation of CVE-2026-61920 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows 10 1607

- [CVE-2026-33824](https://insights.sbomify.com/CVE-2026-33824/): Microsoft Internet Key Exchange (IKE) Service Extensions Double Free (critical 9.8, exploited in the wild)
- [CVE-2026-21510](https://insights.sbomify.com/CVE-2026-21510/): Microsoft Windows Shell Protection Mechanism Failure (high 8.8, exploited in the wild)
- [CVE-2026-21513](https://insights.sbomify.com/CVE-2026-21513/): Microsoft MSHTML Framework Protection Mechanism Failure (high 8.8, exploited in the wild)
- [CVE-2023-32049](https://insights.sbomify.com/CVE-2023-32049/): Microsoft Windows Defender SmartScreen Security Feature Bypass (high 8.8, exploited in the wild)
- [CVE-2023-29360](https://insights.sbomify.com/CVE-2023-29360/): Microsoft Streaming Service Untrusted Pointer Dereference (high 8.4, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61920 and fix it if it is affected.

What it is: CVE-2026-61920 is a medium-severity vulnerability in Microsoft Windows 10 1607, published on 11 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-61920 in the wild and no public exploit code.

Affected product: Microsoft Windows 10 1607. 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-2026-61920/ (Markdown: https://insights.sbomify.com/CVE-2026-61920/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61920
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61920
- OSV: https://osv.dev/vulnerability/CVE-2026-61920

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61920/
Summaries are generated and may contain mistakes; the official description above is the record.