What’s Vulnerable › Vulnerabilities

CVE-2026-25962: MarkUs: Zip bomb in config upload enables DoS

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-409

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.

Affected products

• MarkUsProject Markus: before 2.9.4 — fixed in 2.9.4

How to fix

Upgrade to a fixed version: MarkUsProject Markus 2.9.4. Check the vendor advisory for mitigations.

References

• https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4
• https://github.com/MarkUsProject/Markus/security/advisories/GHSA-x8xv-j7fc-65x5

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