# CVE-2026-26241: QNAP File Station 5 buffer overflow

Source: https://junglewise.ai/threats/cve-2026-26241-qnap-file-station-5-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-10  
License: CC BY 4.0 with a link back

CVE-2026-26241 · Severity: info · CVSS 5.3 · Published 2026-06-10

A security vulnerability has been identified in QNAP File Station 5, a web-based tool used for managing files on QNAP storage devices. An attacker could exploit this flaw to cause the application to crash or to modify its internal memory. This could lead to service disruptions or unauthorized changes to how the system handles data.

Technologies: [QNAP Systems, Inc. File Station 5](https://junglewise.ai/threats/technologies/file-station-5). Vendors: [QNAP Systems, Inc.](https://junglewise.ai/threats/vendors/qnap-systems-inc).

## Quick answers

**Is CVE-2026-26241 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-26241 being exploited in the wild.

**How severe is CVE-2026-26241?** Informational severity, with a CVSS score of 5.3, published 10 June 2026.

**Which products and versions are affected?** QNAP Systems, Inc. File Station 5 versions prior to 5.5.6.5243.

**Is there a fix for CVE-2026-26241?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-26241 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-26241?** Check whether you run QNAP Systems or Inc. File Station 5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow (CWE-121) exists in QNAP File Station 5. The vulnerability can be triggered by a remote attacker, though the CVSS vector suggests some level of user interaction (UI:P) may be required. Successful exploitation allows the attacker to modify memory contents or crash application processes, potentially leading to arbitrary code execution or a denial of service. The issue is resolved in File Station 5 version 5.5.6.5243 and later.

## Affected products

- QNAP Systems, Inc. File Station 5 versions prior to 5.5.6.5243

## Timeline

- 2026-06-10: disclosed
- 2026-06-10: advisory

## References

- [https://www.qnap.com/en/security-advisory/qsa-26-27](https://www.qnap.com/en/security-advisory/qsa-26-27)

## Related threats

- [QNAP File Station 5 stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-26240-qnap-file-station-5-stack-based-buffer-overflow)
- [QNAP File Station 5 stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-26239-qnap-file-station-5-stack-based-buffer-overflow)