CVE-2026-41135

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp	Exploit Vendor Advisory
https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16	Patch
https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:free5gc:free5gc::::::::
	cpe:2.3:a:free5gc:pcf::::::::

History

No history.

Information

Published : 2026-04-22 00:16

Updated : 2026-06-17 10:46

NVD link : CVE-2026-41135

Mitre link : CVE-2026-41135

CVE.ORG link : CVE-2026-41135

JSON object : View

Products Affected

free5gc

free5gc
pcf

CWE

CWE-400

Uncontrolled Resource Consumption

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