# CVE-2026-22899 — QNAP Systems Inc. File Station 5

> As of 2026-06-17, CVE-2026-22899 is a Low-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in QNAP Systems Inc. File Station 5, CVSS v4.0 1.3, EPSS 0.3% (30.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-22899, most recently “QNAP QSA-26-10: Multiple Injection and Memory-Safety Vulnerabilities in QTS, QuTS hero, QuTS cloud, QVP, and File Station (CVE-2025-66273, CVE-2026-26240, and 12 others)”.

**Last updated:** 2026-06-17

## What is CVE-2026-22899?

A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later

The record classifies CVE-2026-22899 under weakness class [CWE-476](https://intel.threadlinqs.com/cwe/CWE-476). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 140 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 1.3 — Low (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 30.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 1.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-10, last modified 2026-06-17

## Is CVE-2026-22899 being exploited?

It currently carries a trending score of 13 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [QNAP Systems Inc.](https://intel.threadlinqs.com/vendors/qnap-systems): File Station 5

## How to fix CVE-2026-22899

No vendor patch reference has been recorded for CVE-2026-22899 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-22899

1 tracked threat in the Threadlinqs corpus references CVE-2026-22899, either in the campaign’s CVE list or as an indicator on the campaign record.

- [QNAP QSA-26-10: Multiple Injection and Memory-Safety Vulnerabilities in QTS, QuTS hero, QuTS cloud, QVP, and File Station (CVE-2025-66273, CVE-2026-26240, and 12 others)](https://intel.threadlinqs.com/threat/TL-2026-0901) — HIGH · 2026-06-22

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [qnap.com](https://www.qnap.com/en/security-advisory/qsa-26-10)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-22899
Full detection coverage and IOCs for threats exploiting CVE-2026-22899 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp