# CVE-2026-5550: Tenda AC10 httpd fromSysToolChangePwd stack-based overflow

> A remote attacker can trigger a stack-based buffer overflow in the Tenda AC10 router's httpd service, potentially leading to arbitrary code execution.

- **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:X`)
- **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:** 5 Apr 2026
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-4p8f-q5hf-m6pr

## What is CVE-2026-5550?

CVE-2026-5550 is a high-severity memory corruption vulnerability in Tenda Ac10 Firmware, published on 5 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was identified in Tenda AC10 16.03.10.10_multi_TDE01. This affects the function fromSysToolChangePwd of the file /bin/httpd. The manipulation leads to stack-based buffer overflow. The attack may be initiated remotely. Multiple endpoints might be affected.

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-2026-5550?

It affects 1 product.


Products: Tenda Ac10 Firmware.

## How do I fix CVE-2026-5550?

No fix has been published for CVE-2026-5550 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5550 being exploited?

There is no known exploitation of CVE-2026-5550 in the wild and no public exploit code.

## Other vulnerabilities in Tenda Ac10 Firmware

- [CVE-2018-14558](https://insights.sbomify.com/CVE-2018-14558/): Tenda AC7, AC9, and AC10 Routers Command Injection (critical 9.8, exploited in the wild)
- [CVE-2025-67073](https://insights.sbomify.com/CVE-2025-67073/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-45779](https://insights.sbomify.com/CVE-2025-45779/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25456](https://insights.sbomify.com/CVE-2025-25456/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25674](https://insights.sbomify.com/CVE-2025-25674/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5550 and fix it if it is affected.

What it is: CVE-2026-5550 is a high-severity memory corruption vulnerability in Tenda Ac10 Firmware, published on 5 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-2026-5550 in the wild and no public exploit code.

Affected product: Tenda Ac10 Firmware. 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-2026-5550/ (Markdown: https://insights.sbomify.com/CVE-2026-5550/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5550
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5550
- OSV: https://osv.dev/vulnerability/CVE-2026-5550

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5550/
Summaries are generated and may contain mistakes; the official description above is the record.