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

CVSS 10.0 · Critical EPSS 0.31% · P24

Affected Version Matrix 1

VendorProductVersion RangeStatus
free5gcfree5gc< 4.2.2affected
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I. Basic Information for CVE-2026-44327

Vulnerability Information
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Vulnerability Title
free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
free5GC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 4.2.2之前版本存在安全漏洞，该漏洞源于NEF挂载nnef-oam路由组时缺少入站OAuth2/bearer-token授权，可能导致未认证请求访问OAM路由。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China 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
Qwen3.6-35B-A3B · 7741 chars
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III. Intelligence Information for CVE-2026-44327

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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

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