CVE-2026-33064

Description

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2 are vulnerable to procedure panic caused by Nil Pointer Dereference in the /sdm-subscriptions endpoint. A remote attacker can cause the UDM service to panic and crash by sending a crafted POST request to the /sdm-subscriptions endpoint with a malformed URL path containing path traversal sequences (../) and a large JSON payload. The DataChangeNotificationProcedure function in notifier.go attempts to access a nil pointer without proper validation, causing a complete service crash with "runtime error: invalid memory address or nil pointer dereference". Exploitation would result in UDM functionality disruption until recovery by restart. This issue has been fixed in version 1.4.2.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-20 | Assigner GitHub_M

Problem types

CWE-478: Missing Default Case in Multiple Condition Expression

Product status

References

github.com/...ree5gc/security/advisories/GHSA-7g27-v5wj-jr75

github.com/free5gc/free5gc/issues/781

github.com/free5gc/udm/pull/78

github.com/...ommit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92

cve.org (CVE-2026-33064)

nvd.nist.gov (CVE-2026-33064)

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