CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE
- Published
- Feb 9, 2026
- Updated
- Feb 10, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Sep 15, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 43.8%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
PoC for Zip Slip in MarkUs Assignment Configuration Uploads
Responsible use
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