GNOME libsoup HTTP Redirect insertion of sensitive information into sent data

Summaryinfo

A vulnerability labeled as problematic has been found in GNOME libsoup. Affected by this issue is some unknown functionality of the component HTTP Redirect Handler. Executing a manipulation can lead to insertion of sensitive information into sent data. The identification of this vulnerability is CVE-2026-1539. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in GNOME libsoup (the affected version unknown). This vulnerability affects an unknown part of the component HTTP Redirect Handler. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality. CVE summarizes:

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2026-1539 since 01/28/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. 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 03/25/2026). This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 297047 (Linux Distros Unpatched Vulnerability : CVE-2026-1539), 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 (297047). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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Vendor

• GNOME

Name

• libsoup

License

• open-source

Website

• Vendor: https://www.gnome.org/

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

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