CVE-2026-27642

free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, remote attackers can inject control characters (e.g., %00) into the supi parameter, triggering internal URL parsing errors (net/url: invalid control character). This exposes system-level error details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UEAU service may be affected. free5gc/udm pull request 75 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.

• CWE-20

• https://github.com/free5gc/free5gc/issues/749Exploit, Issue Tracking, Vendor Advisory
• https://github.com/free5gc/free5gc/security/advisories/GHSA-h4wg-rp7m-8xx4Vendor Advisory
• https://github.com/free5gc/udm/commit/a7af2321ddea6368c43835f90f6d1b9d67dd2ea1Patch
• https://github.com/free5gc/udm/pull/75Issue Tracking, Patch

Published

Feb 24, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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