Overview
The vulnerability CVE-2025-32907 exposes a critical flaw in the libsoup library, which is widely used for HTTP client/server functionality in Gnome applications. This defect allows a malicious client to exploit the HTTP range requests handling, causing resource exhaustion and potentially leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-32907
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
libsoup | All versions before the patched update
How the Exploit Works
The exploit takes advantage of the flaw in libsoup’s implementation of HTTP range requests. A malicious client can manipulate these requests to repeatedly ask for the same range in a single HTTP request. This causes the server to consume excessive memory, leading to a potential denial of service or even a system compromise if the server’s resources are sufficiently taxed.
Conceptual Example Code
The conceptual example below demonstrates how a malicious client could structure an HTTP request to exploit this vulnerability:
GET /resource HTTP/1.1
Host: vulnerable-server.com
Range: bytes=0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50,0-50In this example, the client is requesting the same byte range (“0-50”) multiple times in a single request. This would cause the server to use a disproportionately large amount of memory to handle this request, leading to resource exhaustion.
Mitigation
The preferred mitigation for this vulnerability is to apply the vendor’s patch to correct the flaw in the libsoup library. If the patch cannot be immediately applied, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block malformed range requests can serve as a temporary mitigation strategy.
