CVE-2026-54134: Octoprint

High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.

OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, OctoPrint's custom Tornado upload handler and Flask with Werkzeug parse request parameters differently, allowing an attacker with FILE_UPLOAD permission to inject reserved internal upload fields through query parameters or parser differentials despite the earlier GHSA-m9jh-jf9h-x3h2 fix. The affected endpoints are /api/files/{local|sdcard}, /api/languages, /plugin/backup/restore, and /plugin/pluginmanager/upload_file. An attacker can make OctoPrint treat an arbitrary host file as a temporary upload, move it into a downloadable upload directory, disclose configuration secrets or other readable files, and remove runtime files in a way that can affect a later restart. This issue is fixed in versions 1.11.8 and 2.0.0rc3.

Affected products

• Octoprint Octoprint: before 1.11.8 (fixed in 1.11.8); from 2.0.0rc1, before 2.0.0rc3 (fixed in 2.0.0rc3)

Published 2026-08-21. Last modified 2026-09-30.