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CVE-2026-33064

free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference

Published: Mar 20, 2026Updated: Mar 23, 2026 Sources: CVE List NVDCWE-478
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 62.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-478CWE-476

Affected Products

free5gcfree5gc
On-premNetwork Device
Networking Infrastructure / router-switch
udmfree5gc
Mixed
Networking Infrastructure / network-management
free5gcoss-projectNetworking Infrastructureaka free5gc udm, free5gc smf, udm, smf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
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References

https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75
github.com
https://github.com/free5gc/free5gc/issues/781
github.com
https://github.com/free5gc/udm/pull/78
github.com
and 1 more references View all →

Timeline

Published
Mar 20, 2026
Last Updated
Mar 23, 2026

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