← Vulnerability feed

Vulnerability record · CVE-2026-41135 · published 22 April 2026

CVE-2026-41135: Free5gc uncontrolled resource consumption vulnerability

Free5gc · Free5gc

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.

7.5 CVSS 3.1 High EPSS 0.54% · top 57.0% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp ExploitVendor Advisory
https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16 Patch
https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp ExploitVendor Advisory

Track CVE-2026-41135 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-44327Free5gc missing authentication for critical function vulnerabilityfree5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2…EPSS 0.53%10.0CVE-2026-44329Free5gc missing authentication for critical function vulnerabilityfree5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/b…EPSS 0.56%10.0CVE-2026-44330Free5gc incorrect authorization vulnerabilityfree5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-pfdmanagement route group without inbo…EPSS 0.43%9.8CVE-2023-4659Free5gc cross-site request forgery vulnerabilityCross-Site Request Forgery vulnerability, whose exploitation could allow an attacker to perform different actions on the platform as an administrator…EPSS 0.43%9.4CVE-2026-44326Free5gc missing authorization vulnerabilityfree5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the 3gpp-traffic-influence API without inbound …EPSS 0.53%9.4CVE-2026-44315Free5gc missing authorization vulnerabilityfree5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the 3gpp-pfd-management API without inbound OAu…EPSS 0.53%8.7CVE-2026-40246Free5gc improper authorization vulnerabilityfree5GC is an open-source implementation of the 5G core network. In versions 1.4.2 and below of the UDR service, the handler for deleting Traffic Inf…EPSS 0.45%8.7CVE-2026-40247Free5gc improper authorization vulnerabilityfree5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for reading Traffic Infl…EPSS 0.51%

Source: NIST National Vulnerability Database (record CVE-2026-41135), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.