CVE-2026-25057: Markusproject Markus

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors are able to upload a zip file to create an assignment from an exported configuration (courses/<:course_id>/assignments/upload_config_files). The uploaded zip file entry names are used to create paths to write files to disk without checking these paths. This vulnerability is fixed in 2.9.1.

Affected products

• Markusproject Markus: before 2.9.1 (fixed in 2.9.1)

Published 2026-02-09. Last modified 2026-06-17.