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

Quick assessment

Affected
free5gc free5gc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 7.5 Difficulty: Easy EPSS 0.78% · P55

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Switch语句中缺失缺省条件
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
free5gc free5gc < 1.4.2 -

II. Public POCs for CVE-2026-33064

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III. Intelligence Information for CVE-2026-33064

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Patches & Fixes for CVE-2026-33064 (2)

Vendor Advisories for CVE-2026-33064 (1)

Proof of Concept for CVE-2026-33064 (1)

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

Same product: free5gc
Same vendor: free5gc

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