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CVE-2026-33065— free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request

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UDM错误处理不当，将下游400错误转换为500错误，可能泄露内部错误处理行为。

AI Predicted 5.3 Difficulty: Easy EPSS 0.28% · P21
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I. Basic Information for CVE-2026-33065

Vulnerability Information
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Vulnerability Title
free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request
Source: CVE Program / CVE List V5
Vulnerability Description
Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling DELETE requests with an empty supi path parameter. This leaks internal error handling behavior and makes it difficult for clients to distinguish between client-side errors and server-side failures. When a client sends a DELETE request with an empty supi (e.g., double slashes // in URL path), the UDM forwards the malformed request to UDR, which correctly returns 400. However, UDM propagates this as 500 SYSTEM_FAILURE instead of returning the appropriate 400 error to the client. This violates REST API best practices for DELETE operations. The issue has been patched 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:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
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UDM错误处理不当，将下游400错误转换为500错误，可能泄露内部错误处理行为。
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-2026-33065

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III. Intelligence Information for CVE-2026-33065

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Patches & Fixes for CVE-2026-33065 (2)

Vendor Advisories for CVE-2026-33065 (1)

Other References for CVE-2026-33065 (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-2026-33064 free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
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
Same weakness: CWE-209

V. Comments for CVE-2026-33065

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