# CVE-2026-41286: Stack-based Buffer Overflow in WatchGuard Agent Discovery Service on Windows Causes Denial of Service - Variant B

> An unauthenticated local network attacker can crash the WatchGuard Agent service via a stack-based buffer overflow.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 May 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-hgvw-h399-c9rx

## What is CVE-2026-41286?

CVE-2026-41286 is a high-severity memory corruption vulnerability in WatchGuard Agent, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Stack-based Buffer Overflow vulnerability in the WatchGuard Agent discovery service on Windows allows Overflow Buffers. An unauthenticated attacker on the same local network could exploit this vulnerability to crash the agent service.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-41286?

It affects 1 product.


Products: Watchguard Agent.

## How do I fix CVE-2026-41286?

No fix has been published for CVE-2026-41286 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41286 being exploited?

There is no known exploitation of CVE-2026-41286 in the wild and no public exploit code.

## Other vulnerabilities in WatchGuard Agent

- [CVE-2026-6787](https://insights.sbomify.com/CVE-2026-6787/): Usage of a hard-coded cryptographic key in WatchGuard Agent allows inclusion of code into existing process (high 8.5)
- [CVE-2026-6788](https://insights.sbomify.com/CVE-2026-6788/): Uncontrolled search path in PluginLauncher allows SYSTEM code execution in WatchGuard Agent (high 8.5)
- [CVE-2026-41288](https://insights.sbomify.com/CVE-2026-41288/): WatchGuard Agent on Windows Privilege Escalation Vulnerability (high 7.3)
- [CVE-2026-41287](https://insights.sbomify.com/CVE-2026-41287/): Stack-based Buffer Overflow in WatchGuard Agent Discovery Service on Windows Causes Denial of Service - Variant A (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41286 and fix it if it is affected.

What it is: CVE-2026-41286 is a high-severity memory corruption vulnerability in WatchGuard Agent, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-41286 in the wild and no public exploit code.

Affected product: WatchGuard Agent. 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-2026-41286/ (Markdown: https://insights.sbomify.com/CVE-2026-41286/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41286
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41286
- OSV: https://osv.dev/vulnerability/CVE-2026-41286

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41286/
Summaries are generated and may contain mistakes; the official description above is the record.