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CVE-2026-44321— free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)

CVSS 7.5 · High EPSS 0.36% · P29

Affected Version Matrix 1

VendorProductVersion RangeStatus
free5gcfree5gc< 4.2.2affected
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I. Basic Information for CVE-2026-44321

Vulnerability Information
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Vulnerability Title
free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)
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 SMF mounts the UPI management route group without inbound OAuth2 middleware. The POST /upi/v1/upNodesLinks create-or-update handler accepts attacker-controlled JSON and passes it directly into UpNodesFromConfiguration(), which calls logger.InitLog.Fatalf(...) on several validation failures. One confirmed path is the UE-IP-pool overlap check: a single unauthenticated POST that adds a new UPF whose pool overlaps an existing UPF terminates the entire SMF process (docker ps shows Exited (1)), not just the goroutine. 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:U/C:N/I:N/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SMF挂载UPI管理路由组时缺少入站OAuth2中间件，可能导致单个未认证POST请求终止SMF进程。
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-2026-44321

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8562 chars
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III. Intelligence Information for CVE-2026-44321

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Patches & Fixes for CVE-2026-44321 (1)

Vendor Advisories for CVE-2026-44321 (2)

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

CVE-2026-4433010.0 CRITICALfree5GC: NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD
CVE-2026-4432710.0 CRITICALfree5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM hand
CVE-2026-4432910.0 CRITICALfree5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read
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-2026-443257.5 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-2026-443197.5 HIGHfree5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-contr
CVE-2026-443167.5 HIGHfree5GC: PCF npcf-smpolicycontrol POST /sm-policies panics on downstream UDR/OpenAPI 404 v
CVE-2026-443207.3 HIGHfree5GC: NEF nnef-callback route group is unauthenticated; forged callback requests are ac
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-2026-443186.5 MEDIUMfree5GC: BSF concurrent PUT /nbsf-management/v1/subscriptions/{subId} crashes the BSF proc
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-2026-44321

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