# CVE-2026-26240: File Station 5

> Remote attackers can exploit a buffer overflow in QNAP File Station 5 to modify memory, potentially leading to code execution or service crashes.

- **Severity:** Low 1.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Jun 2026
- **Updated:** 17 Jun 2026
- **Also known as:** GHSA-872q-mhr9-36mh

## What is CVE-2026-26240?

CVE-2026-26240 is a low-severity memory corruption vulnerability in Qnap File Station, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A buffer overflow vulnerability has been reported to affect File Station 5. The remote attackers can then exploit the vulnerability to modify memory or crash processes.

We have already fixed the vulnerability in the following version:
File Station 5 5.5.6.5243 and later

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-26240?

It affects 1 product.


Products: Qnap File Station.

## How do I fix CVE-2026-26240?

No fix has been published for CVE-2026-26240 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-26240 being exploited?

There is no known exploitation of CVE-2026-26240 in the wild and no public exploit code.

## Other vulnerabilities in Qnap File Station

- [CVE-2025-29883](https://insights.sbomify.com/CVE-2025-29883/): File Station 5 (high 8.3)
- [CVE-2025-29884](https://insights.sbomify.com/CVE-2025-29884/): File Station 5 (high 8.3)
- [CVE-2025-29885](https://insights.sbomify.com/CVE-2025-29885/): File Station 5 (high 8.3)
- [CVE-2025-30279](https://insights.sbomify.com/CVE-2025-30279/): File Station 5 (high 8.3)
- [CVE-2025-33031](https://insights.sbomify.com/CVE-2025-33031/): File Station 5 (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26240 and fix it if it is affected.

What it is: CVE-2026-26240 is a low-severity memory corruption vulnerability in Qnap File Station, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-26240 in the wild and no public exploit code.

Affected product: Qnap File Station. 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-2026-26240/ (Markdown: https://insights.sbomify.com/CVE-2026-26240/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26240
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26240
- OSV: https://osv.dev/vulnerability/CVE-2026-26240

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26240/
Summaries are generated and may contain mistakes; the official description above is the record.