CVE-2026-39993: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-v238-v8p6-v2x6
Share
CWE-23
Published
Advisory Summary

CVE-2026-39993 is a HIGH security vulnerability vulnerability (CWE-23: Relative Path Traversal) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-39993 at a Glance

CVE Identifier CVE-2026-39993
GHSA Identifier GHSA-v238-v8p6-v2x6
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-23: Relative Path Traversal
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-39993

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-39993, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-23: Relative Path Traversal, where the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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

References

NVD — CVE-2026-39993 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39993
www.qnap.com/en/app_releasenotes... WEB
https://www.qnap.com/en/app_releasenotes/list.php?app_choose=DownloadStation

Frequently Asked Questions

What is CVE-2026-39993?
CVE-2026-39993 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-23: Relative Path Traversal.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-39993?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-39993?
CVE-2026-39993 is classified under CWE-23: Relative Path Traversal (The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.).
How can I check Maven dependencies for CVE-2026-39993?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-v238-v8p6-v2x6",
  "modified" : "2026-10-15T09:30:33Z",
  "published" : "2026-10-15T09:30:33Z",
  "aliases" : [ "CVE-2026-39993" ],
  "details" : "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.\n\nWe have already fixed the vulnerability in the following version:\nDownload Station 5.10.2.313 and later\nDownload Station 5.11.3.322 and later",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-39993"
  }, {
    "type" : "WEB",
    "url" : "https://www.qnap.com/en/app_releasenotes/list.php?app_choose=DownloadStation"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-23" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-15T07:18:00Z"
  }
}