Critical severity · published Feb 9, 2026
CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Markus · MarkUsProject
< 2.9.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25057
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25057
Patch
https://github.com/MarkUsProject/Markus/commit/0ca002a1f0071c7a00dbb2ed34fede57323c5dc7
Product
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1
Vendor Advisory
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-mccg-p332-252h
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