# CVE-2026-109157: TRENDnet TEW-432BRP formTcpipSetup stack-based overflow

> Remote attackers can execute arbitrary code via a stack-based buffer overflow in the TCP/IP setup form of this end-of-life router.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:** 13 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-6vrm-8cq2-whh8

## What is CVE-2026-109157?

CVE-2026-109157 is a critical memory corruption vulnerability in TRENDnet TEW-432BRP, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in TRENDnet TEW-432BRP 3.10B20. Affected by this vulnerability is the function formTcpipSetup of the file /goform/formTcpipSetup. Performing a manipulation of the argument Name results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor confirms: "As this router was EOL'd in 2011, we have no way of testing if such vulnerability exists. We will notify our customers of a potential vulnerability on this product." This vulnerability only affects products that are no longer supported by the maintainer.

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-2026-109157?


## How do I fix CVE-2026-109157?

No fix has been published for CVE-2026-109157 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-109157 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109157 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-109157 and fix it if it is affected.

What it is: CVE-2026-109157 is a critical memory corruption vulnerability in TRENDnet TEW-432BRP, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109157 exists.

Affected product: TRENDnet TEW-432BRP. 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-2026-109157/ (Markdown: https://insights.sbomify.com/CVE-2026-109157/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-109157
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109157
- OSV: https://osv.dev/vulnerability/CVE-2026-109157

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-109157/
Summaries are generated and may contain mistakes; the official description above is the record.