CVE catalog
CVE-2026-41135
free5GC UDR is the Policy Control Function (PCF) for…
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.
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.52% · Oct 27, 2026
Reported versions and fixes
Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.
Version impact has not been established. The original provider fields are retained below.
Provider details and historical evidence
Original provider fields
{
"package_releases": [],
"fixed_versions": [],
"distribution_packages": [
{
"name": "free5gc",
"ecosystem": "cpe",
"fixed_version": "",
"provider_source": "nvd"
},
{
"name": "pcf",
"ecosystem": "cpe",
"fixed_version": "1.4.3",
"provider_source": "nvd"
},
{
"name": "free5gc",
"ranges": [
{
"fixed": "",
"introduced": "",
"last_affected": "4.2.1",
"start_excluding": ""
}
],
"ecosystem": "cpe",
"provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41135",
"fixed_version": "",
"provider_source": "nvd",
"provider_record_id": "NVD-CVE-2026-41135",
"provider_updated_at": "2026-10-26T22:10:00.163"
},
{
"name": "pcf",
"ranges": [
{
"fixed": "1.4.3",
"introduced": "",
"last_affected": "",
"start_excluding": ""
}
],
"ecosystem": "cpe",
"provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41135",
"fixed_version": "1.4.3",
"provider_source": "nvd",
"provider_record_id": "NVD-CVE-2026-41135",
"provider_updated_at": "2026-10-26T22:10:00.163"
}
]
}OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
Observed: