Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1310 CNY

100%
Buy Us a Coffee

CVE-2026-44327— free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler

CVSS 10.0 · Critical

Affected Version Matrix 1

VendorProductVersion RangeStatus
free5gcfree5gc< 4.2.2affected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-44327

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
free5gcfree5gc < 4.2.2 -

II. Public POCs for CVE-2026-44327

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-44327

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-44327 (1)

Vendor Advisories for CVE-2026-44327 (2)

Same Patch Batch · free5gc · 2026-05-27 · 20 CVEs total

CVE-2026-4432910.0 CRITICALfree5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read
CVE-2026-4433010.0 CRITICALfree5GC: NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD
CVE-2026-443269.4 CRITICALfree5GC: NEF 3gpp-traffic-influence API is unauthenticated; missing or forged bearer token
CVE-2026-443159.4 CRITICALfree5GC: NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create,
CVE-2026-420838.2 HIGHfree5GC: PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated
CVE-2026-443288.2 HIGHfree5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF
CVE-2026-443167.5 HIGHfree5GC: PCF npcf-smpolicycontrol POST /sm-policies panics on downstream UDR/OpenAPI 404 v
CVE-2026-443257.5 HIGHfree5GC: NRF POST /oauth2/token structured-form parser type-confusion panic family (Reflec
CVE-2026-443227.5 HIGHfree5GC: NEF 3gpp-pfd-management PATCH applications/{appId} panics on UDR access failure d
CVE-2026-443217.5 HIGHfree5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (
CVE-2026-443197.5 HIGHfree5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-contr
CVE-2026-443207.3 HIGHfree5GC: NEF nnef-callback route group is unauthenticated; forged callback requests are ac
CVE-2026-443186.5 MEDIUMfree5GC: BSF concurrent PUT /nbsf-management/v1/subscriptions/{subId} crashes the BSF proc
CVE-2026-443246.5 MEDIUMfree5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing UE state via nil interface
CVE-2026-443176.5 MEDIUMfree5GC: PCF npcf-policyauthorization POST /app-sessions panics on suppFeat=1 with missing
CVE-2026-420816.1 MEDIUMfree5GC: UE Security Capability bypass on NGAP PathSwitchRequest
CVE-2026-443234.3 MEDIUMfree5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing subsId when UE state exist
CVE-2026-420823.7 LOWfree5GC: Missing Concurrent NAS SMC Validation During NGAP Handover
CVE-2026-42459free5GC: Improper Input Validation and Generation of Error Message Containing Sensitive In

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-306

V. Comments for CVE-2026-44327

No comments yet

Leave a comment