Free5GC up to 1.4.1 PATCH Request information exposure

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Free5GC up to 1.4.1. This impacts an unknown function of the component PATCH Request Handler. The manipulation leads to information exposure. This vulnerability is documented as CVE-2026-33192. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Free5GC up to 1.4.1 and classified as problematic. This issue affects an unknown functionality of the component PATCH Request Handler. The manipulation with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. Impacted is availability. The summary by CVE is:

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling PATCH requests with an empty supi path parameter. Additionally, the UDM incorrectly translates the PATCH method to PUT when forwarding to UDR, indicating a deeper architectural issue. This leaks internal error handling behavior, making it difficult for clients to distinguish between client-side errors and server-side failures. The issue has been patched in version 1.4.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-33192 since 03/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 303459 (Linux Distros Unpatched Vulnerability : CVE-2026-33192), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.4.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (303459). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Free5GC

Version

• 1.4.0
• 1.4.1

Website

• Product: https://github.com/free5gc/free5gc/

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Be aware that VulDB is the high quality source for vulnerability data.

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