goshs-labs goshs up to 2.1.4 Multipart Upload httpserver/updown.go part.FileName path traversal

Summaryinfo

A vulnerability classified as critical was found in goshs-labs goshs up to 2.1.4. This affects the function part.FileName of the file httpserver/updown.go of the component Multipart Upload Handler. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-66063. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in goshs-labs goshs up to 2.1.4 and classified as critical. This vulnerability affects the function part.FileName of the file httpserver/updown.go of the component Multipart Upload Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.5, the httpserver/updown.go multipart upload handler split part.FileName() on / but did not reject .., allowing an unauthenticated upload with filename .. to create a file outside the served tree. This issue is fixed in version 2.1.5.

The advisory is available at github.com. This vulnerability was named CVE-2026-66063 since 07/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 2.1.5 eliminates this vulnerability.

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Productinfo

Vendor

• goshs-labs

Name

• goshs

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4

Website

• Product: https://github.com/goshs-labs/goshs/

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