CVE-2026-33064 affects Free5GC versions prior to 1.4.2. The vulnerability is a remotely triggerable nil pointer dereference in the UDM service, specifically in the handling of POST requests to the /sdm-subscriptions endpoint. According to the provided content, a crafted request using a malformed URL path containing path traversal sequences (such as ../) together with a large JSON payload can reach DataChangeNotificationProcedure in notifier.go, where a nil pointer is accessed without proper validation. This results in a Go runtime panic with an "invalid memory address or nil pointer dereference" error and causes the UDM process to crash.
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