Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity security flaw in Markus from MarkUsProject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 77.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
MarkUsProject	Markus	< 2.9.4

Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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