CVE-2026-25962CWE-409

MarkUs: Zip bomb in config upload enables DoS

Medium · published March 6, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
39.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00463 · 39.1th percentile
Weakness
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
Published
2026-03-06T02:48Z
EPSS history
Timeline
  • 06 MAR 02:48Z
    MarkUs: Zip bomb in config upload enables DoS
    cvelistv5