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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
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 60.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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

free5gc
oss-projectaka free5gc smf, smf, udm, free5gc udm
free5gcOn-premNetwork Device
Networking Infrastructure / router-switch
udmOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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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 →

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