CVE-2026-33064 Details
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.
A denial-of-service vulnerability has been identified in Free5GC versions prior to 1.4.2. The issue arises in the UDM service's DataChangeNotificationProcedure, where a nil pointer dereference occurs. This vulnerability can be exploited by sending a crafted POST request to the /sdm-subscriptions endpoint, using a malformed URL path that includes path traversal sequences and a large JSON payload. The lack of proper validation allows the request to cause a runtime error, leading to a complete service crash. Recovery requires a manual restart of the UDM service.
Users should upgrade to Free5GC version 1.4.2 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/free5gc/free5gc/issues/781 | [email protected] | ExploitIssue TrackingPatchVendor Advisory |
| https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75 | [email protected] | PatchVendor Advisory |
| https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92 | [email protected] | Patch |
| https://github.com/free5gc/udm/pull/78 | [email protected] | Issue TrackingPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
| CWE-478 | Missing Default Case in Multiple Condition Expression | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| free5gc udm | < 1.4.2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 23, 2026 | Initial Analysis | [email protected] |
| Mar 20, 2026 | New CVE Received | [email protected] |