OpenListTeam OpenList up to 4.2.2 Offline Download client.go SimpleHttp.Run path traversal

Summaryinfo

A vulnerability classified as problematic has been found in OpenListTeam OpenList up to 4.2.2. This issue affects the function SimpleHttp.Run of the file internal/offline_download/http/client.go of the component Offline Download. Performing a manipulation results in path traversal. This vulnerability was named CVE-2026-75602. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenListTeam OpenList up to 4.2.2. This affects the function SimpleHttp.Run of the file internal/offline_download/http/client.go of the component Offline Download. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. The summary by CVE is:

OpenList a file list program that supports multiple storage. Prior to 4.2.3, OpenList's offline-download feature at POST /api/fs/add_offline_download with tool: "SimpleHttp" accepts an attacker-supplied URL and saves its bytes under a per-task temporary directory before transferring them to the user's destination storage. The temporary filename comes from the attacker-controlled Content-Disposition header, is passed from parseFilenameFromContentDisposition in internal/offline_download/http/util.go to filepath.Join(task.TempDir, filename) in SimpleHttp.Run in internal/offline_download/http/client.go, and is opened with os.Create without a containment check. Because filepath.Join cleans .. segments, a non-admin user with PermAddOfflineDownload on any path can traverse out of task.TempDir and create, truncate, or overwrite any file writable by the OpenList process whose parent directory already exists. The server/handles/offline_download.go AddOfflineDownload route uses normal user authentication rather than AuthAdmin, and local-storage destinations fall through tryPutUrl in internal/offline_download/tool/add.go to the vulnerable SimpleHttp.Run path. This issue is fixed in version 4.2.3.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-75602 since 08/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 4.2.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-70550). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• OpenListTeam

Name

• OpenList

Version

• 4.2.0
• 4.2.1
• 4.2.2

Website

• Product: https://github.com/OpenListTeam/OpenList/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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