Overview
This report discusses a significant flaw in libsoup, a widely used HTTP client/server library for GNOME. The vulnerability, identified as CVE-2025-32908, primarily affects the HTTP/2 server component of the library and, if exploited, could result in a denial of service (DoS) attack or potential system compromise. The widespread use of libsoup in various applications makes this vulnerability highly critical and demands immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-32908
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise, and data leakage
Affected Products
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Product | Affected Versions
libsoup | All versions prior to the latest patch
How the Exploit Works
The vulnerability stems from the HTTP/2 server’s incomplete validation of the pseudo-headers :scheme, :authority, and :path. This lack of validation allows an attacker to send a maliciously crafted request that the server fails to handle correctly, resulting in a denial of service. In some cases, this could also lead to system compromise and data leakage.
Conceptual Example Code
An attacker might exploit this vulnerability by sending a request similar to this:
POST / HTTP/2
Host: target.example.com
:scheme: http
:authority: target.example.com
:path: /malicious/path
Content-Type: application/json
{ "malicious_payload": "..." }In the above example, the `:path` pseudo-header has been manipulated with a malicious path, which the server fails to validate correctly, causing an error and potential denial of service. The actual malicious payload would depend on the specific context and target.
