# CVE-2026-69429: Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability

> An authorized attacker can execute arbitrary code remotely via a heap-based buffer overflow in the Windows IKE Protocol Extensions.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/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:** 8 Sep 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-4f9x-4hw5-fjhp

## What is CVE-2026-69429?

CVE-2026-69429 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1809, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Heap-based buffer overflow in Windows IKE Extension allows an authorized attacker to execute code over a network.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-69429?

It affects 10 products.


Products: Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.

## How do I fix CVE-2026-69429?

No fix has been published for CVE-2026-69429 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-69429 being exploited?

There is no known exploitation of CVE-2026-69429 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows 10 1809

- [CVE-2024-29988](https://insights.sbomify.com/CVE-2024-29988/): Microsoft SmartScreen Prompt Security Feature Bypass (high 8.8, exploited in the wild)
- [CVE-2024-21412](https://insights.sbomify.com/CVE-2024-21412/): Microsoft Windows Internet Shortcut Files Security Feature Bypass (high 8.1, exploited in the wild)
- [CVE-2025-62221](https://insights.sbomify.com/CVE-2025-62221/): Microsoft Windows Use After Free (high 7.8, exploited in the wild)
- [CVE-2025-30400](https://insights.sbomify.com/CVE-2025-30400/): Microsoft Windows DWM Core Library Use-After-Free (high 7.8, exploited in the wild)
- [CVE-2024-21338](https://insights.sbomify.com/CVE-2024-21338/): Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-69429 and fix it if it is affected.

What it is: CVE-2026-69429 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1809, published on 8 Sep 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-2026-69429 in the wild and no public exploit code.

Affected product: Microsoft Windows 10 1809. 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-2026-69429/ (Markdown: https://insights.sbomify.com/CVE-2026-69429/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-69429
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-69429
- OSV: https://osv.dev/vulnerability/CVE-2026-69429

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-69429/
Summaries are generated and may contain mistakes; the official description above is the record.