GNOME libsoup Cookie Domain case sensitivity

Summaryinfo

A vulnerability classified as problematic was found in GNOME libsoup. This affects an unknown part of the component Cookie Domain Handler. Executing a manipulation can lead to an unknown weakness. This vulnerability appears as CVE-2025-4035. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in GNOME libsoup (version unknown) and classified as problematic. This vulnerability affects an unknown function of the component Cookie Domain Handler. The CWE definition for the vulnerability is CWE-178. The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results. As an impact it is known to affect integrity. CVE summarizes:

A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.

The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2025-4035 since 04/28/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/18/2025).

The vulnerability scanner Nessus provides a plugin with the ID 237830 (RHEL 10 : libsoup3 (RHSA-2025:8128)), 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 databases at Tenable (237830) and EUVD (EUVD-2025-15014). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• GNOME

Name

• libsoup

License

• open-source

Website

• Vendor: https://www.gnome.org/

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• 🔍

CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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