High 8.7Published Mar 20, 2026

CVE-2026-33064free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference

Updated under an hour ago (Oct 27, 2026, 4:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-478
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

free5gc free5gc free5gc:free5gc (from the name)	before 1.4.2	CNA record
free5gc udm free5gc:udm	before 1.4.2	NVD

References

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75	x-refsource-confirm, patch, vendor-advisory
https://github.com/free5gc/free5gc/issues/781	x-refsource-misc, exploit, issue-tracking, patch, vendor-advisory
https://github.com/free5gc/udm/pull/78	x-refsource-misc, issue-tracking, patch
https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.