by Kastro
Paper/Archive/CVE-2026-25057

CVE-2026-25057

MarkUsProject Markus — Zip Slip in MarkUs config upload allowing RCE

EPSS 0.5%CVSS 9.1
critical.is priorityof 100
36
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 45.1.451 × 209.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Markus< 2.9.1–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/MarkUsProject/Markus/security/advisories/GHSA-mccg-p332-252hrefgithub.com/MarkUsProject/Markus/commit/0ca002a1f0071c7a00dbb2ed34fede57323c5dc7refgithub.com/MarkUsProject/Markus/releases/tag/v2.9.1