CVE-2026-41135: CWE-400: Uncontrolled Resource Consumption in free5gc pcf
CVE-2026-41135 is a memory leak vulnerability in free5GC's Policy Control Function (PCF) affecting versions prior to 1. 4. 3. An unauthenticated attacker with network access to the PCF SBI interface can cause uncontrolled memory growth by repeatedly sending HTTP requests to the OAM endpoint. This occurs because a new CORS middleware is registered on every incoming request, causing the Gin router's handler chain to grow indefinitely. The resulting memory exhaustion leads to denial of service, preventing user equipment from obtaining necessary policies and blocking 5G session establishment. Version 1. 4. 3 includes a patch to fix this issue.
AI Analysis
Technical Summary
The vulnerability in free5GC PCF (CVE-2026-41135) is due to a memory leak caused by improper middleware registration within an HTTP handler. Specifically, the router.Use() call inside the handler registers a new CORS middleware on every request, causing the Gin router's handler chain to grow without bounds. This leads to progressive memory exhaustion and ultimately denial of service of the PCF component. The PCF is critical for policy control in 5G core networks, and its failure disrupts policy delivery and session establishment for user equipment. The issue affects all versions before 1.4.3, which contains a patch addressing this problem.
Potential Impact
An unauthenticated attacker can exploit this vulnerability remotely to cause uncontrolled memory consumption on the PCF, leading to denial of service. This disrupts the delivery of access and session management policies to user equipment, effectively blocking 5G session establishment. The impact is high availability degradation of the 5G core network's policy control function, potentially affecting network operations and user connectivity.
Mitigation Recommendations
A patch is available in free5GC version 1.4.3 that fixes the memory leak vulnerability. Users should upgrade to version 1.4.3 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official fix. Patch status beyond the version update is not explicitly stated, so check the vendor advisory for the latest guidance.
CVE-2026-41135: CWE-400: Uncontrolled Resource Consumption in free5gc pcf
Description
CVE-2026-41135 is a memory leak vulnerability in free5GC's Policy Control Function (PCF) affecting versions prior to 1. 4. 3. An unauthenticated attacker with network access to the PCF SBI interface can cause uncontrolled memory growth by repeatedly sending HTTP requests to the OAM endpoint. This occurs because a new CORS middleware is registered on every incoming request, causing the Gin router's handler chain to grow indefinitely. The resulting memory exhaustion leads to denial of service, preventing user equipment from obtaining necessary policies and blocking 5G session establishment. Version 1. 4. 3 includes a patch to fix this issue.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in free5GC PCF (CVE-2026-41135) is due to a memory leak caused by improper middleware registration within an HTTP handler. Specifically, the router.Use() call inside the handler registers a new CORS middleware on every request, causing the Gin router's handler chain to grow without bounds. This leads to progressive memory exhaustion and ultimately denial of service of the PCF component. The PCF is critical for policy control in 5G core networks, and its failure disrupts policy delivery and session establishment for user equipment. The issue affects all versions before 1.4.3, which contains a patch addressing this problem.
Potential Impact
An unauthenticated attacker can exploit this vulnerability remotely to cause uncontrolled memory consumption on the PCF, leading to denial of service. This disrupts the delivery of access and session management policies to user equipment, effectively blocking 5G session establishment. The impact is high availability degradation of the 5G core network's policy control function, potentially affecting network operations and user connectivity.
Mitigation Recommendations
A patch is available in free5GC version 1.4.3 that fixes the memory leak vulnerability. Users should upgrade to version 1.4.3 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official fix. Patch status beyond the version update is not explicitly stated, so check the vendor advisory for the latest guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-17T12:59:15.738Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e80fc419fe3cd2cd07fdbf
Added to database: 4/22/2026, 12:01:08 AM
Last enriched: 4/29/2026, 11:29:01 AM
Last updated: 6/6/2026, 2:07:59 AM
Views: 133
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