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CVE-2026-41136— free5GC AMF missing default case in Content-Type switch in HTTPUEContextTransfer

Quick assessment

Affected
free5gc amf
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 1.4.3之前版本存在安全漏洞，该漏洞源于HTTPUEContextTransfer处理程序在Content-Type switch语句中缺少default情况，当请求包含不受支持的Content-Type时，可能导致使用未初始化的UeContextTransferRequest对象。

AI Predicted 8.1 Difficulty: Easy EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-41136

Vulnerability Information
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Vulnerability Title
free5GC AMF missing default case in Content-Type switch in HTTPUEContextTransfer
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. Prior to version 1.4.3, the `HTTPUEContextTransfer` handler in `internal/sbi/api_communication.go` does not include a `default` case in the `Content-Type` switch statement. When a request arrives with an unsupported `Content-Type`, the deserialization step is silently skipped, `err` remains `nil`, and the processor is invoked with a completely uninitialized `UeContextTransferRequest` object. Version 1.4.3 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
预期行为违背
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 1.4.3之前版本存在安全漏洞，该漏洞源于HTTPUEContextTransfer处理程序在Content-Type switch语句中缺少default情况，当请求包含不受支持的Content-Type时，可能导致使用未初始化的UeContextTransferRequest对象。
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 amf < 1.4.3 -

II. Public POCs for CVE-2026-41136

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III. Intelligence Information for CVE-2026-41136

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Vendor Advisories for CVE-2026-41136 (1)

Same Patch Batch · free5gc · 2026-04-21 · 3 CVEs total

CVE-2026-41135 7.5 HIGH free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial
CVE-2026-40343 free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPost allows unintended subscripti

IV. Related Vulnerabilities

Same product: amf
Same vendor: free5gc
Same weakness: CWE-440

V. Comments for CVE-2026-41136

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