CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE
CRITICAL 9.1EPSS 0.5%
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
- MarkUsProject · Markus
- CVSS v3.1 GITHUB
- 9.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.53% chance of exploitation in the next 30 days, 44th percentile
- Published
- 2026-02-09
- Updated
- 2026-02-10
Proof-of-concept exploits (1)
- ustr/CVE-2026-250571★ · 2026-09-23
Security advisories
- MarkUsProject/Markus/security/advisories/GHSA-mccg-p332-252h
- MarkUsProject/Markus/commit/0ca002a1f0071c7a00dbb2ed34fede57323c5dc7