GHSA-585V-HCGF-JHFR Free5GC UDM has Improper Input Validation and Generation of Error Messages Containing Sensitive Information

Summary The free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm Subscriber Data Management service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500...

CVE-2026-27642

In free5GC UDM (Nudm_UEAU), versions up to 1.4.1 are affected. Remote attackers can inject control characters (for example, %00) into the supi parameter, triggering net/url parsing errors and exposing system‑level error details, enabling service fingerprinting. A fix is available via free5gc/udm ...