CVE-2025-32914 in libsoup
Summary
by MITRE • 04/14/2025
A flaw was found in libsoup, where the soup_multipart_new_from_message() function is vulnerable to an out-of-bounds read. This flaw allows a malicious HTTP client to induce the libsoup server to read out of bounds.
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Analysis
by VulDB Data Team • 12/10/2025
The vulnerability identified as CVE-2025-32914 resides within the libsoup library, a widely-used HTTP client and server library for applications built on the glib framework. This issue manifests in the soup_multipart_new_from_message() function which processes multipart HTTP messages containing multiple parts of data. The flaw represents a classic out-of-bounds read vulnerability that occurs when the function fails to properly validate input data from HTTP messages, particularly those containing multipart content. The vulnerability is particularly concerning as it can be triggered by a remote attacker who controls the HTTP client, making it exploitable in various network-based attack scenarios.
The technical implementation of this vulnerability stems from insufficient bounds checking within the multipart message parsing logic. When the soup_multipart_new_from_message() function processes incoming HTTP messages, it does not adequately verify the boundaries of data structures or array indices before accessing memory locations. This allows an attacker to craft malicious HTTP requests with specially formatted multipart content that causes the server application to read memory beyond the intended buffer boundaries. The out-of-bounds read can potentially expose sensitive information from memory, cause application crashes, or provide an attacker with information that could be leveraged for further exploitation. This type of vulnerability falls under CWE-129, which specifically addresses improper validation of array indices, and can be classified as a memory safety issue within the context of the ATT&CK framework under the technique of privilege escalation through memory corruption.
The operational impact of CVE-2025-32914 extends significantly across various applications and services that rely on libsoup for HTTP communication. Servers and applications that handle multipart HTTP requests, such as file upload handlers, API endpoints, or web services, become vulnerable to this flaw. The vulnerability can lead to service disruption through crashes, information disclosure through memory leaks, or potentially provide attackers with footholds for more sophisticated attacks. Since libsoup is commonly used in desktop applications, web servers, and mobile applications, the potential attack surface is broad and affects both client and server implementations. The vulnerability is particularly dangerous in environments where applications process untrusted HTTP input from external sources without proper sanitization, as it can be exploited without requiring any special privileges from the attacker.
Mitigation strategies for CVE-2025-32914 should focus on immediate patching of affected libsoup versions, as the most effective solution involves updating to a patched release that properly validates multipart message boundaries. Organizations should prioritize updating their applications that depend on libsoup to ensure they are using versions that contain the necessary fixes. Additionally, implementing network-level protections such as web application firewalls or proxy servers that can filter malformed multipart requests can provide an additional layer of defense. Input validation and sanitization should be reinforced at application layers that handle HTTP communications, ensuring that all multipart content is properly validated before being passed to libsoup functions. Monitoring and logging should be enhanced to detect unusual patterns in HTTP request processing that might indicate exploitation attempts, and regular security assessments should be conducted to identify other potential vulnerabilities in the application stack that might be exploited in conjunction with this flaw.