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CVE-2025-40928: Buffer Overflow Vulnerability in JSON::XS for Perl

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Overview

The vulnerability CVE-2025-40928 pertains to JSON::XS for Perl before version 4.04. This vulnerability presents a significant risk to any systems or applications utilizing this package, as it can lead to a system compromise or data leakage. It is crucial for system administrators and developers to understand this vulnerability and apply appropriate mitigation strategies.

Vulnerability Summary

CVE ID: CVE-2025-40928
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

JSON::XS for Perl | < 4.04 How the Exploit Works

The exploit takes advantage of an integer buffer overflow vulnerability in JSON::XS for Perl. The flaw allows an attacker to cause a segfault by parsing crafted JSON data. This can lead to denial of service attacks or other unspecified impacts.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. An attacker could send a specially crafted JSON payload to a vulnerable endpoint:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "..." }

In this example, the “malicious_payload” field contains the crafted JSON data that triggers the buffer overflow, leading to potential system compromise or data leakage.

Mitigation

To mitigate this vulnerability, users are advised to apply the vendor’s patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. It is recommended to update to JSON::XS version 4.04 or later to fully address the vulnerability.

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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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