{"cve":"CVE-2026-41135","nvd":{"published":"2026-04-22T00:16:29.287","modified":"2026-10-26T22:10:00.163","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["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"],"products":["free5gc:free5gc","free5gc:pcf"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-41135","score":0.00515,"percentile":0.43572,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-98cp-84m9-q3qp","url":"https://osv.dev/vulnerability/GHSA-98cp-84m9-q3qp","summary":"free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial of Service","modified":"2026-06-25T19:56:26.767007390Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/pcf","purl":"pkg:golang/github.com/free5gc/pcf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]},{"id":"GO-2026-5278","url":"https://osv.dev/vulnerability/GO-2026-5278","summary":"free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial of Service in github.com/free5gc/pcf","modified":"2026-06-25T19:45:26.297632033Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/pcf","purl":"pkg:golang/github.com/free5gc/pcf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}