# CVE-2026-75976: TRENDnet TEW-823DRU NVRAM wan.cgi strcpy stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the wan.cgi component via the wan_l2tp_password parameter, potentially leading to code execution.

- **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:** 18 Aug 2026
- **Updated:** 25 Aug 2026
- **Also known as:** GHSA-h8w7-jqg9-6hfv

## What is CVE-2026-75976?

CVE-2026-75976 is a critical memory corruption vulnerability in TRENDnet TEW-823DRU, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A weakness has been identified in TRENDnet TEW-823DRU 1.1.02b01. Impacted is the function strcpy of the file /cgi-bin/wan.cgi of the component NVRAM. This manipulation of the argument wan_l2tp_password causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

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-2026-75976?


## How do I fix CVE-2026-75976?

No fix has been published for CVE-2026-75976 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75976 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75976 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75976 and fix it if it is affected.

What it is: CVE-2026-75976 is a critical memory corruption vulnerability in TRENDnet TEW-823DRU, published on 18 Aug 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-2026-75976 exists.

Affected product: TRENDnet TEW-823DRU. 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-2026-75976/ (Markdown: https://insights.sbomify.com/CVE-2026-75976/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75976
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75976
- OSV: https://osv.dev/vulnerability/CVE-2026-75976

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-75976/
Summaries are generated and may contain mistakes; the official description above is the record.