# CVE-2026-69839: Windows iSCSI Target Service Denial of Service Vulnerability

> An authorized attacker can cause a denial of service in the Windows iSCSI Target Service via an uncaught exception.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-6pcm-j3qf-mrjq

## What is CVE-2026-69839?

CVE-2026-69839 is a medium-severity denial of service vulnerability in Microsoft Windows 10 1607, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Uncaught exception in Windows iSCSI Target Service allows an authorized attacker to deny service over a network.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2026-69839?

It affects 7 products.


Products: Microsoft Windows 10 1607, Microsoft Windows 10 1809, 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-2026-69839?

No fix has been published for CVE-2026-69839 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-69839 being exploited?

There is no known exploitation of CVE-2026-69839 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-2026-69839 and fix it if it is affected.

What it is: CVE-2026-69839 is a medium-severity denial of service vulnerability in Microsoft Windows 10 1607, 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-2026-69839 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-2026-69839/ (Markdown: https://insights.sbomify.com/CVE-2026-69839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-69839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-69839
- OSV: https://osv.dev/vulnerability/CVE-2026-69839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-69839/
Summaries are generated and may contain mistakes; the official description above is the record.