MarkUs: Zip bomb in config upload enables DoS
Priority LOW 29CWE-409Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00295 22nd percentileScored 2026-11-07
Fix Fixed Markus (MarkUsProject): 2.9.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MarkUsProject | Markus | before 2.9.4 | 2.9.4 | Patch available | CNA |
- Markus VendorMarkUsProject Affected before 2.9.4 Fixed in 2.9.4 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:markusproject:markus:*:*:*:*:*:*:*:* | before 2.9.4 | Vulnerable | MarkUsProject |
- cpe:2.3:a:markusproject:markus:*:*:*:*:*:*:*:* Versions before 2.9.4 Vulnerable ·MarkUsProject
Remediation
- Fix · CNA Markus (MarkUsProject) Fixed in 2.9.4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-25962
References
More MarkUsProject Markus vulnerabilities
- TI-2026-20241 Zip Slip in MarkUs config upload allowing RCE CVSS 3.1CRITICAL 9.1
- TI-2026-22679 MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions CVSS 3.1HIGH 8.0
- TI-2024-34648 Arbitrary File Write leading up to remote code execution (instructor accounts) CVSS 4.0HIGH 7.1
- TI-2024-34420 MarkUs Arbitrary File Write leading up to remote code execution (student accounts) CVSS 4.0HIGH 7.1
- TI-2026-20085 MarkUs has a submission-view IDOR exposes all student submissions CVSS 3.1MEDIUM 6.5
- TI-2024-32087 MarkUs vulnerable to Path Traversal CVSS 3.1MEDIUM 5.7
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences