# CVE-2026-4567: Tenda A15 UploadCfg stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the UploadCfg function of Tenda A15 routers, potentially leading to code execution or service disruption.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 23 Mar 2026
- **Also known as:** GHSA-xhj3-xwvq-rwxj

## What is CVE-2026-4567?

CVE-2026-4567 is a critical memory corruption vulnerability in Tenda A15, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in Tenda A15 15.13.07.13. The impacted element is the function UploadCfg of the file /cgi-bin/UploadCfg. The manipulation of the argument File leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public 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-2026-4567?

It affects 1 product.


Products: Tenda A15 Firmware.

## How do I fix CVE-2026-4567?

No fix has been published for CVE-2026-4567 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4567 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4567 exists.

Public exploit code:

- https://github.com/George0Papasotiriou/CVE-2026-4567-Post-Quantum-KEM-Timing-Side-Channel-Kyber-Decapsulation- (github_poc): https://github.com/George0Papasotiriou/CVE-2026-4567-Post-Quantum-KEM-Timing-Side-Channel-Kyber-Decapsulation-

## Other vulnerabilities in Tenda A15

- [CVE-2022-47115](https://insights.sbomify.com/CVE-2022-47115/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-47117](https://insights.sbomify.com/CVE-2022-47117/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-47118](https://insights.sbomify.com/CVE-2022-47118/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-47119](https://insights.sbomify.com/CVE-2022-47119/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-47120](https://insights.sbomify.com/CVE-2022-47120/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4567 and fix it if it is affected.

What it is: CVE-2026-4567 is a critical memory corruption vulnerability in Tenda A15, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4567 exists.

Affected product: Tenda A15. 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-2026-4567/ (Markdown: https://insights.sbomify.com/CVE-2026-4567/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4567
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4567
- OSV: https://osv.dev/vulnerability/CVE-2026-4567

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4567/
Summaries are generated and may contain mistakes; the official description above is the record.