CVE-2025-4476 MEDIUM

CVE-2025-4476: Libsoup: null pointer dereference in libsoup may lead to denial of service

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-476
Published May 16, 2025
Last update May 6, 2026

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.

Key dates

02Disclosure timeline

May 16, 2025 CVE published
May 6, 2026 Record updated