# CVE-2026-3809: Tenda FH1202 NatSaticSetting fromNatStaticSetting stack-based overflow

> A remote attacker can trigger a stack-based buffer overflow in the Tenda FH1202 router via the NatStaticSetting interface, potentially leading to code execution or denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **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:** 9 Mar 2026
- **Updated:** 10 Mar 2026
- **Also known as:** GHSA-pcvx-47vr-9mpx

## What is CVE-2026-3809?

CVE-2026-3809 is a high-severity memory corruption vulnerability in Tenda Fh1202 Firmware, published on 9 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A flaw has been found in Tenda FH1202 1.2.0.14(408). The impacted element is the function fromNatStaticSetting of the file /goform/NatSaticSetting. Executing a manipulation of the argument page can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been published and may be used.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-3809?

It affects 1 product.


Products: Tenda Fh1202 Firmware.

## How do I fix CVE-2026-3809?

No fix has been published for CVE-2026-3809 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3809 being exploited?

There is no known exploitation of CVE-2026-3809 in the wild and no public exploit code.

## Other vulnerabilities in Tenda Fh1202 Firmware

- [CVE-2024-30584](https://insights.sbomify.com/CVE-2024-30584/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-30587](https://insights.sbomify.com/CVE-2024-30587/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-30589](https://insights.sbomify.com/CVE-2024-30589/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-30593](https://insights.sbomify.com/CVE-2024-30593/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-30595](https://insights.sbomify.com/CVE-2024-30595/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3809 and fix it if it is affected.

What it is: CVE-2026-3809 is a high-severity memory corruption vulnerability in Tenda Fh1202 Firmware, published on 9 Mar 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-2026-3809 in the wild and no public exploit code.

Affected product: Tenda Fh1202 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-2026-3809/ (Markdown: https://insights.sbomify.com/CVE-2026-3809/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3809
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3809
- OSV: https://osv.dev/vulnerability/CVE-2026-3809

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3809/
Summaries are generated and may contain mistakes; the official description above is the record.