CVE-2026-41135

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.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.31%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
free5gc	free5gc	< 4.2.1
free5gc	pcf	< 1.4.3

References

Advisories & Patches

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

Exploits

https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-41135? +

CVE-2026-41135 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41135? +

CVE-2026-41135 affects products from free5gc, specifically: free5gc, pcf. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41135? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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