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CVE-2026-41135— free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial of Service

Quick assessment

Affected
free5gc pcf
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之前版本存在资源管理错误漏洞，该漏洞源于内存泄漏问题，允许未经身份验证的攻击者通过向OAM端点发送重复HTTP请求导致内存无限增长，最终造成拒绝服务。

CVSS 7.5 · High EPSS 0.54% · P43
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I. Basic Information for CVE-2026-41135

Vulnerability Information
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Vulnerability Title
free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC UDR is the Policy Control Function (PCF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. A memory leak vulnerability in versions prior to 1.4.3 allows any unauthenticated attacker with network access to the PCF SBI interface to cause uncontrolled memory growth by sending repeated HTTP requests to the OAM endpoint. The root cause is a `router.Use()` call inside an HTTP handler that registers a new CORS middleware on every incoming request, permanently growing the Gin router's handler chain. This leads to progressive memory exhaustion and eventual Denial of Service of the PCF, preventing all UEs from obtaining AM and SM policies and blocking 5G session establishment. Version 1.4.3 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
free5GC 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于内存泄漏问题，允许未经身份验证的攻击者通过向OAM端点发送重复HTTP请求导致内存无限增长，最终造成拒绝服务。
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 pcf < 1.4.3 -

II. Public POCs for CVE-2026-41135

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III. Intelligence Information for CVE-2026-41135

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Patches & Fixes for CVE-2026-41135 (1)

Vendor Advisories for CVE-2026-41135 (1)

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

CVE-2026-40343 free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPost allows unintended subscripti
CVE-2026-41136 free5GC AMF missing default case in Content-Type switch in HTTPUEContextTransfer

IV. Related Vulnerabilities

Same product: pcf
Same vendor: free5gc
Same weakness: CWE-400

V. Comments for CVE-2026-41135

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