# CVE-2026-69588: Windows TCP/IP Denial of Service Vulnerability

> An unauthorized attacker can cause a denial of service in Windows TCP/IP due to a memory leak, requiring a security patch.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-h3jj-c6v2-c99r

## What is CVE-2026-69588?

CVE-2026-69588 is a high-severity denial of service vulnerability in Microsoft Windows 11 23h2, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Missing release of memory after effective lifetime in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2026-69588?

It affects 6 products.


Products: Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2022, Microsoft Windows Server 2025.

## How do I fix CVE-2026-69588?

No fix has been published for CVE-2026-69588 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-69588 being exploited?

There is no known exploitation of CVE-2026-69588 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows 11 23h2

- [CVE-2026-81963](https://insights.sbomify.com/CVE-2026-81963/): Microsoft Windows Link Following (high 7.8, exploited in the wild)
- [CVE-2026-100219](https://insights.sbomify.com/CVE-2026-100219/): Microsoft QUIC Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-96909](https://insights.sbomify.com/CVE-2026-96909/): Windows BitLocker Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-62815](https://insights.sbomify.com/CVE-2026-62815/): Microsoft QUIC Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-45657](https://insights.sbomify.com/CVE-2026-45657/): Windows Kernel Remote Code Execution Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-69588 and fix it if it is affected.

What it is: CVE-2026-69588 is a high-severity denial of service vulnerability in Microsoft Windows 11 23h2, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-69588 in the wild and no public exploit code.

Affected product: Microsoft Windows 11 23h2. 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-2026-69588/ (Markdown: https://insights.sbomify.com/CVE-2026-69588/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-69588
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-69588
- OSV: https://osv.dev/vulnerability/CVE-2026-69588

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-69588/
Summaries are generated and may contain mistakes; the official description above is the record.