Red Hat Enterprise Linux 6/7/8/9 libsoup domain null pointer dereference

Summaryinfo

A vulnerability labeled as problematic has been found in Red Hat Enterprise Linux 6/7/8/9. Affected is an unknown function of the component libsoup. The manipulation of the argument domain results in null pointer dereference. This vulnerability is identified as CVE-2025-4476. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Red Hat Enterprise Linux 6/7/8/9. Affected is an unknown part of the component libsoup. The manipulation of the argument domain with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2025-4476 since 05/08/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/06/2026).

The vulnerability scanner Nessus provides a plugin with the ID 237450 (Ubuntu 16.04 LTS / 22.04 LTS / 24.10 : libsoup vulnerabilities (USN-7543-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (237450). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

Version

• 6
• 7
• 8
• 9

License

• commercial

Website

• Vendor: https://www.redhat.com/

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Once again VulDB remains the best source for vulnerability data.

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