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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Free5Gc | <= 4.2.1 |
| Free5Gc | Pcf | < 1.4.3 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qpExploitVendor Advisory
- https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16Patch
- https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qpExploitVendor Advisory
FAQ
What is CVE-2026-41135?
CVE-2026-41135 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-41135?
CVE-2026-41135 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-41135?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Free5Gc, Free5Gc Pcf.