CVE-2026-25962 MarkUs: Zip bomb in config upload enables DoS

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs currently extracts zip files without any size or entry-count limits. For example, instructors can upload a zip file to provide an assignment configuration; students can upload a zip...

CVE-2026-27807 MarkUs: YAML alias (‘billion laughs’) DoS in config upload

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities e.g., assignment settings. These YAML files are parsed with aliases enabled. This issue has been patch...

CVE-2026-28405

MarkUs (web-based submission and grading system) is affected by CVE-2026-28405 through the submissions/html_content route, where content from a student-submitted file is rendered without sanitization prior to version 2.9.1. The root cause is lack of input sanitization in how submitted files are r...