Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Udm | < 1.4.2 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/781ExploitIssue TrackingPatch
- https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75PatchVendor Advisory
- https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92Patch
- https://github.com/free5gc/udm/pull/78Issue TrackingPatch
FAQ
What is CVE-2026-33064?
CVE-2026-33064 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-33064?
CVE-2026-33064 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33064?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Udm.