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CVE-2025-32906: Out-of-Bound Read Vulnerability in libsoup

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Overview

CVE-2025-32906 is a critical vulnerability discovered in libsoup, a widely-used HTTP client/server library in C. If exploited, this flaw could allow a malicious actor to crash the HTTP server, potentially leading to a system compromise or data leakage. Given the severity of this flaw, it is crucial for affected systems to mitigate the risk as quickly as possible.

Vulnerability Summary

CVE ID: CVE-2025-32906
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, data leakage

Affected Products

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Product | Affected Versions

libsoup | All versions prior to patch

How the Exploit Works

The vulnerability lies in the soup_headers_parse_request() function within the libsoup library. A malicious user could send a specially crafted HTTP request to trigger an out-of-bound read, causing the HTTP server to crash. This crash could potentially allow further exploitation, leading to system compromise and data leakage.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP request that could exploit this vulnerability:

GET / HTTP/1.1
Host: target.example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
If-Modified-Since: Thu, 01 Jan 1970 00:00:00 GMT
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Pragma: no-cache

In this example, specific combinations of headers or values may trigger the out-of-bound read, leading to a server crash.

Mitigation Guidance

Users of libsoup are strongly recommended to apply the vendor patch as soon as possible. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation to filter out malicious HTTP requests.

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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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