CVE-2026-39993 Path Traversal to Root RCE in QNAP Download Station via Addon/Search addon Parameter
Authenticated attackers can exploit path traversal in QNAP Download Station to read sensitive files and potentially achieve root remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39993?
CVE-2026-39993 is a high-severity path traversal vulnerability in QNAP Systems Inc. Download Station, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A relative path traversal vulnerability has been reported to affect Download Station. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data.
We have already fixed the vulnerability in the following version: Download Station 5.10.2.313 and later Download Station 5.11.3.322 and later
Weakness: CWE-23
Which versions are affected by CVE-2026-39993?
How do I fix CVE-2026-39993?
No fix has been published for CVE-2026-39993 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-39993 being exploited?
There is no known exploitation of CVE-2026-39993 in the wild and no public exploit code.
Sources
Also known as GHSA-v238-v8p6-v2x6.