# CVE-2026-7470: Tenda 4G300 SafeMacFilter sub_427C3C stack-based overflow

> A stack-based buffer overflow in the Tenda 4G300 router allows remote attackers to execute arbitrary code via the SafeMacFilter interface.

- **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:** 30 Apr 2026
- **Updated:** 4 May 2026
- **Also known as:** GHSA-jc4x-cmh7-8379

## What is CVE-2026-7470?

CVE-2026-7470 is a high-severity memory corruption vulnerability in Tenda 4G300, published on 30 Apr 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 4G300 US_4G300V1.0Mt_V1.01.42_CN_TDC01. Affected is the function sub_427C3C of the file /goform/SafeMacFilter. This manipulation of the argument page causes stack-based buffer overflow. Remote exploitation of the attack is possible. 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-2026-7470?

It affects 1 product.


Products: Tenda 4g300 Firmware.

## How do I fix CVE-2026-7470?

No fix has been published for CVE-2026-7470 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7470 being exploited?

There is no known exploitation of CVE-2026-7470 in the wild and no public exploit code.

## Other vulnerabilities in Tenda 4G300

- [CVE-2023-38929](https://insights.sbomify.com/CVE-2023-38929/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-37718](https://insights.sbomify.com/CVE-2023-37718/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-37721](https://insights.sbomify.com/CVE-2023-37721/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-37722](https://insights.sbomify.com/CVE-2023-37722/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-37723](https://insights.sbomify.com/CVE-2023-37723/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7470 and fix it if it is affected.

What it is: CVE-2026-7470 is a high-severity memory corruption vulnerability in Tenda 4G300, published on 30 Apr 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-2026-7470 in the wild and no public exploit code.

Affected product: Tenda 4G300. 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-2026-7470/ (Markdown: https://insights.sbomify.com/CVE-2026-7470/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7470
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7470
- OSV: https://osv.dev/vulnerability/CVE-2026-7470

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7470/
Summaries are generated and may contain mistakes; the official description above is the record.