# CVE-2026-11736: Stack-based buffer overflow vulnerability in some NETGEAR Nighthawk routers

> An authenticated admin can exploit a stack-based buffer overflow to modify router software and functionality, potentially leading to code execution.

- **Severity:** Low 1.9 (`CVSS:4.0/AV:A/AC:H/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:L/U:Amber`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-rxvc-mxwf-46c8

## What is CVE-2026-11736?

CVE-2026-11736 is a low-severity memory corruption vulnerability in Netgear Rax50 Firmware, published on 11 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A stack-based buffer overflow vulnerability affects certain NETGEAR models allowing an authenticated admin user to make unauthorized modification to router software and functionality.

Weakness: CWE-787 (Out-of-bounds Write), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-11736?

It affects 19 products.


Products: Netgear Rax20 Firmware, Netgear Rax35v2 Firmware, Netgear Rax41 Firmware, Netgear Rax41v2 Firmware, Netgear Rax42 Firmware, Netgear Rax42v2 Firmware, Netgear Rax43 Firmware, Netgear Rax43v2 Firmware, Netgear Rax45 Firmware, Netgear Rax49s Firmware, Netgear Rax50 Firmware, Netgear Rax50s Firmware, Netgear Rax50v2 Firmware, Netgear Rax54sv2 Firmware, Netgear Rax54v2 Firmware, Netgear Raxe450 Firmware, Netgear Raxe500 Firmware, Netgear Xr1000 Firmware, Netgear Xr1000v2 Firmware.

## How do I fix CVE-2026-11736?

No fix has been published for CVE-2026-11736 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11736 being exploited?

There is no known exploitation of CVE-2026-11736 in the wild and no public exploit code.

## Other vulnerabilities in Netgear Rax50 Firmware

- [CVE-2026-11737](https://insights.sbomify.com/CVE-2026-11737/): Some NETGEAR Nighthawk devices allow administrators to tamper with the device (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11736 and fix it if it is affected.

What it is: CVE-2026-11736 is a low-severity memory corruption vulnerability in Netgear Rax50 Firmware, published on 11 Aug 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-2026-11736 in the wild and no public exploit code.

Affected product: Netgear Rax50 Firmware. 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-2026-11736/ (Markdown: https://insights.sbomify.com/CVE-2026-11736/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11736
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11736
- OSV: https://osv.dev/vulnerability/CVE-2026-11736

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11736/
Summaries are generated and may contain mistakes; the official description above is the record.