CVE-2026-25962— MarkUs: Zip bomb in config upload enables DoS
Quick assessment
Affected
MarkUsProject Markus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MarkUs是MarkUs开源的一个 Ruby on Rails 和 React web 应用程序，用于提交和评分学生作业。 MarkUs 2.9.4之前版本存在安全漏洞，该漏洞源于提取zip文件时没有大小或条目数量限制。
Possible ATT&CK Techniques 1 AI
T1608 · Stage Capabilities
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I. Basic Information for CVE-2026-25962
Vulnerability Information
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Vulnerability Title
MarkUs: Zip bomb in config upload enables DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
MarkUs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MarkUs是MarkUs开源的一个 Ruby on Rails 和 React web 应用程序，用于提交和评分学生作业。 MarkUs 2.9.4之前版本存在安全漏洞，该漏洞源于提取zip文件时没有大小或条目数量限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MarkUsProject | Markus | < 2.9.4 | - |
|
II. Public POCs for CVE-2026-25962
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-25962 (1)
-
Zip bomb enables DoS · Advisory · MarkUsProject/Markus · GitHub x_refsource_CONFIRM
Vendor Pages for CVE-2026-25962 (1)
-
Release v2.9.4 · MarkUsProject/Markus · GitHub x_refsource_MISC
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V. Comments for CVE-2026-25962
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