Medium severity · published Mar 6, 2026
CVE-2026-25962
MarkUs: Zip bomb in config upload enables DoS
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs currently extracts zip files without any size or entry-count limits. For example, instructors can upload a zip file to provide an assignment configuration; students can upload a zip file for an assignment submission and indicate its contents should be extracted. This issue has been patched in version 2.9.4.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Markus · MarkUsProject
< 2.9.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25962
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25962
Product
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4
Vendor Advisory
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-x8xv-j7fc-65x5
More from Markus
9.1
CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE
8.8
CVE-2024-51743
MarkUs is a web application for the submission and grading of student assignments
8.8
CVE-2024-51499
MarkUs is a web application for the submission and grading of student assignments
6.5
CVE-2026-24900
MarkUs has a submission-view IDOR exposes all student submissions
5.4
CVE-2026-28405
MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions