What is CVE-2026-25962?

CVE-2026-25962 is a medium-severity vulnerability in Markusproject Markus, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 6.5/10. Published 2026-03-06.

How severe is CVE-2026-25962?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Markusproject Markus

CVE-2026-25962

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.

EPSS: 0.003 (17.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Markusproject Markus — versions < 2.9.4

Weakness classification (CWE)

CWE-409 — Improper Handling of Highly Compressed Data (Data Amplification)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-25962?: CVE-2026-25962 is a medium-severity vulnerability in Markusproject Markus, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 6.5/10. Published 2026-03-06.
How severe is CVE-2026-25962?: Medium severity. CVSS v3 base score is 6.5 out of 10.