CVE-2026-44327Critical· 10.0▾ Midnightfree5GC 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…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 55 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
0.3% → 0.5%
Last analysed / modified upstream
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.
free5gc < 4.2.2Upgrade past the affected range:
free5gc 4.2.2Affected packages:
github.com/free5gc/nef <= 1.2.3Connected by shared product, vendor, weakness, or advisory.
CVE-2026-44328High· 8.2free5GC is an open-source implementation of the 5G core network
CVE-2026-44329Critical· 10.0free5GC is an open-source implementation of the 5G core network
CVE-2026-44326Critical· 9.4free5GC is an open-source implementation of the 5G core network
CVE-2026-44320High· 7.3free5GC is an open-source implementation of the 5G core network
CVE-2026-44321High· 7.5free5GC is an open-source implementation of the 5G core network
CVE-2026-44315Critical· 9.4free5GC is an open-source implementation of the 5G core network