CVE-2026-25057

CRITICAL9.1

Zip Slip in MarkUs config upload allowing RCE

Published Feb 9, 2026

Modified 3 weeks ago

Details

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.

References

WEB

https://github.com/MarkUsProject/Markus/commit/0ca002a1f0071c7a00dbb2ed34fede57323c5dc7

WEB

https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1

WEB

https://github.com/MarkUsProject/Markus/security/advisories/GHSA-mccg-p332-252h

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-25057

CVSS Analysis

CVSS v3.1

9.1