Is CVE-2026-66063 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66063?

CVE-2026-66063 has a CVSS v3 severity of MEDIUM (6.5).

Back

CVE-2026-66063

Description

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.