CVE-2026-33064— free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
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I. Basic Information for CVE-2026-33064
Vulnerability Information
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Vulnerability Title
free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Switch语句中缺失缺省条件
Source: NVD (National Vulnerability Database)
Vulnerability Title
free5GC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 1.4.2之前版本存在安全漏洞，该漏洞源于/sdm-subscriptions端点存在空指针取消引用，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33064
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Same Patch Batch · free5gc · 2026-03-20 · 7 CVEs total
| CVE-2026-32937 | free5GC CHF has Out-of-Bounds Slice Access that Leads to DoS | |
| CVE-2026-33062 | free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter | |
| CVE-2026-33063 | free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion | |
| CVE-2026-33065 | free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscripti | |
| CVE-2026-33191 | free5GC UDM vulnerable to null byte injection in URL path parameters causing 500 Internal | |
| CVE-2026-33192 | free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptio |
IV. Related Vulnerabilities
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free5gc UDR improper path validation allows unauthenticated - CVE-2026-40247
free5gc UDR improper path validation allows unauthenticated - CVE-2026-40246
free5gc UDR improper path validation allows unauthenticated - CVE-2026-40245
Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI
Same vendor: free5gc
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free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPos - CVE-2026-40249
free5gc UDR fail-open request handling in PolicyDataSubsToNo - CVE-2026-40248
free5gc UDR improper path validation allows unauthenticated
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