CVE-2026-33064
free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
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.
INFO
Published Date :
March 20, 2026, 8:16 a.m.
Last Modified :
March 23, 2026, 6:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Free5GC to version 1.4.2 or later.
- Apply vendor security patches when available.
- Validate input data for nil pointers.
- Restart the UDM service if affected.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33064.
| URL | Resource |
|---|---|
| https://github.com/free5gc/free5gc/issues/781 | Exploit Issue Tracking Patch Vendor Advisory |
| https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75 | Patch Vendor Advisory |
| https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92 | Patch |
| https://github.com/free5gc/udm/pull/78 | Issue Tracking Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33064 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33064
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33064 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33064 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:a:free5gc:udm:*:*:*:*:*:go:*:* versions up to (excluding) 1.4.2 Added Reference Type GitHub, Inc.: https://github.com/free5gc/free5gc/issues/781 Types: Exploit, Issue Tracking, Patch, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75 Types: Patch, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/free5gc/udm/pull/78 Types: Issue Tracking, Patch -
New CVE Received by [email protected]
Mar. 20, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-478 Added Reference https://github.com/free5gc/free5gc/issues/781 Added Reference https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75 Added Reference https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92 Added Reference https://github.com/free5gc/udm/pull/78