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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-4035)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2025-8128 advisory.

    - Fix CVE-2025-4035, CVE-2025-4948, CVE-2025-32049, CVE-2025-32907

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:8128 advisory.

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access     Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate     packages.  libsoup uses the Glib main loop and is designed to work well with GTK applications. This     enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion,     very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who     want it), but the SOAP parts were removed long ago.

    Security Fix(es):

    * libsoup: Denial of Service attack to websocket server (CVE-2025-32049)

    * libsoup: Denial of service in server when client requests a large amount of  overlapping ranges with     Range header (CVE-2025-32907)

    * libsoup: Cookie domain validation bypass via uppercase characters in libsoup (CVE-2025-4035)

    * libsoup: Integer Underflow in soup_multipart_new_from_message() Leading to Denial of Service in libsoup     (CVE-2025-4948)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the libsoup package has been released.

ID	Name	Product	Family	Severity
244936	Linux Distros Unpatched Vulnerability : CVE-2025-4035	Nessus	Misc.	medium
240857	Oracle Linux 10 : libsoup3 (ELSA-2025-8128)	Nessus	Oracle Linux Local Security Checks	medium
237830	RHEL 10 : libsoup3 (RHSA-2025:8128)	Nessus	Red Hat Local Security Checks	medium
236799	Photon OS 5.0: Libsoup PHSA-2025-5.0-0522	Nessus	PhotonOS Local Security Checks	medium

Detections

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CVE-2025-4035

medium

Tenable Plugins

medium

medium

medium

medium