# CVE-2026-7031: Tenda F456 SafeMacFilter fromSafeMacFilter buffer overflow

> A remote attacker can trigger a buffer overflow in the Tenda F456 router's SafeMacFilter function, potentially leading to code execution or service disruption.

- **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:** 26 Apr 2026
- **Updated:** 27 Apr 2026
- **Also known as:** GHSA-f5jv-x3hm-4g73

## What is CVE-2026-7031?

CVE-2026-7031 is a high-severity memory corruption vulnerability in Tenda F456, published on 26 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was detected in Tenda F456 1.0.0.5. This impacts the function fromSafeMacFilter of the file /goform/SafeMacFilter. The manipulation of the argument page results in buffer overflow. It is possible to launch the attack remotely. The exploit is now public and may be used.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-7031?

It affects 1 product.


Products: Tenda F456 Firmware.

## How do I fix CVE-2026-7031?

No fix has been published for CVE-2026-7031 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7031 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7031 exists.

## Other vulnerabilities in Tenda F456

- [CVE-2026-7078](https://insights.sbomify.com/CVE-2026-7078/): Tenda F456 httpd SetIpBind fromSetIpBind buffer overflow (high 8.7)
- [CVE-2026-7079](https://insights.sbomify.com/CVE-2026-7079/): Tenda F456 httpd AdvSetWan fromAdvSetWan buffer overflow (high 8.7)
- [CVE-2026-7080](https://insights.sbomify.com/CVE-2026-7080/): Tenda F456 httpd PPTPUserSetting fromPPTPUserSetting buffer overflow (high 8.7)
- [CVE-2026-7081](https://insights.sbomify.com/CVE-2026-7081/): Tenda F456 httpd GstDhcpSetSer fromGstDhcpSetSer buffer overflow (high 8.7)
- [CVE-2026-7082](https://insights.sbomify.com/CVE-2026-7082/): Tenda F456 httpd WrlExtraSet formWrlExtraSet buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7031 and fix it if it is affected.

What it is: CVE-2026-7031 is a high-severity memory corruption vulnerability in Tenda F456, published on 26 Apr 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-2026-7031 exists.

Affected product: Tenda F456. 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-2026-7031/ (Markdown: https://insights.sbomify.com/CVE-2026-7031/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7031
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7031
- OSV: https://osv.dev/vulnerability/CVE-2026-7031

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7031/
Summaries are generated and may contain mistakes; the official description above is the record.