Cloudanix VulnDB

CVE-2026-42091

Medium · 6.5

CVSS

6.5

EPSS

0.2%

Published

May 4, 2026

CISA due date

—

The record

goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.

Affected packages

Ecosystem Package Introduced Fixed

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