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CVE-2025-10858: Denial of Service Vulnerability Discovered in GitLab CE/EE

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Overview

An issue has been identified in GitLab CE/EE, affecting multiple versions of the software, that allows unauthenticated users to initiate a Denial of Service (DoS) attack through the upload of large, specifically crafted JSON files. This vulnerability has significant implications as it can potentially compromise the system or lead to data leakage.

Vulnerability Summary

CVE ID: CVE-2025-10858
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service and potential system compromise or data leakage

Affected Products

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Product | Affected Versions

GitLab CE | All versions before 18.2.7
GitLab EE | 18.3 before 18.3.3, 18.4 before 18.4.1

How the Exploit Works

The vulnerability allows unauthenticated users to execute a Denial of Service attack by uploading large, specifically crafted JSON files. This exploit causes excessive resource consumption on the server, effectively causing a DoS condition. In some cases, this could potentially lead to a system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how an attacker might exploit this vulnerability:

POST /upload_endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "large_malicious_json": "..." }

In this example, the attacker sends a POST request to the `/upload_endpoint` of the target server, containing a large malicious JSON payload, causing the server to consume excessive resources and trigger a DoS condition.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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