CVE-2026-66063: Goshs-Labs Goshs

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Goshs-Labs Goshs: before 2.1.5 (fixed in 2.1.5)

Published 2026-07-28. Last modified 2026-07-30.