free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has no inbound auth middleware, so every future OAM operation added to this group inherits the missing auth boundary by default. This vulnerability is fixed in 4.2.2.
References
| Link | Resource |
|---|---|
| https://github.com/free5gc/free5gc/issues/861 | Exploit Issue Tracking |
| https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3 | Exploit Vendor Advisory |
| https://github.com/free5gc/nef/pull/23 | Issue Tracking Patch |
| https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3 | Exploit Vendor Advisory |
Configurations
History
28 May 2026, 16:24
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Free5gc free5gc
Free5gc |
|
| References | () https://github.com/free5gc/free5gc/issues/861 - Exploit, Issue Tracking | |
| References | () https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3 - Exploit, Vendor Advisory | |
| References | () https://github.com/free5gc/nef/pull/23 - Issue Tracking, Patch | |
| CPE | cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* |
28 May 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3 - |
27 May 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 17:16
Updated : 2026-05-28 16:24
NVD link : CVE-2026-44327
Mitre link : CVE-2026-44327
CVE.ORG link : CVE-2026-44327
JSON object : View
Products Affected
free5gc
- free5gc