CVE-2026-44321— free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
II. Public POCs 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-2026-44330 | 10.0 CRITICAL | free5GC: NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD |
| CVE-2026-44327 | 10.0 CRITICAL | free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM hand |
| CVE-2026-44329 | 10.0 CRITICAL | free5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read |
| CVE-2026-44326 | 9.4 CRITICAL | free5GC: NEF 3gpp-traffic-influence API is unauthenticated; missing or forged bearer token |
| CVE-2026-44315 | 9.4 CRITICAL | free5GC: NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, |
| CVE-2026-42083 | 8.2 HIGH | free5GC: PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated |
| CVE-2026-44328 | 8.2 HIGH | free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF |
| CVE-2026-44325 | 7.5 HIGH | free5GC: NRF POST /oauth2/token structured-form parser type-confusion panic family (Reflec |
| CVE-2026-44322 | 7.5 HIGH | free5GC: NEF 3gpp-pfd-management PATCH applications/{appId} panics on UDR access failure d |
| CVE-2026-44319 | 7.5 HIGH | free5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-contr |
| CVE-2026-44316 | 7.5 HIGH | free5GC: PCF npcf-smpolicycontrol POST /sm-policies panics on downstream UDR/OpenAPI 404 v |
| CVE-2026-44320 | 7.3 HIGH | free5GC: NEF nnef-callback route group is unauthenticated; forged callback requests are ac |
| CVE-2026-44324 | 6.5 MEDIUM | free5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing UE state via nil interface |
| CVE-2026-44317 | 6.5 MEDIUM | free5GC: PCF npcf-policyauthorization POST /app-sessions panics on suppFeat=1 with missing |
| CVE-2026-44318 | 6.5 MEDIUM | free5GC: BSF concurrent PUT /nbsf-management/v1/subscriptions/{subId} crashes the BSF proc |
| CVE-2026-42081 | 6.1 MEDIUM | free5GC: UE Security Capability bypass on NGAP PathSwitchRequest |
| CVE-2026-44323 | 4.3 MEDIUM | free5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing subsId when UE state exist |
| CVE-2026-42082 | 3.7 LOW | free5GC: Missing Concurrent NAS SMC Validation During NGAP Handover |
| CVE-2026-42459 | free5GC: Improper Input Validation and Generation of Error Message Containing Sensitive In |
IV. Related Vulnerabilities
Same product: free5gc
- CVE-2026-42081
free5GC: UE Security Capability bypass on NGAP PathSwitchReq - CVE-2026-42082
free5GC: Missing Concurrent NAS SMC Validation During NGAP H - CVE-2026-42083
free5GC: PCF Npcf_SMPolicyControl missing authentication mid - CVE-2026-42459
free5GC: Improper Input Validation and Generation of Error M - CVE-2026-44315
free5GC: NEF 3gpp-pfd-management API is unauthenticated; for
Same vendor: free5gc
- CVE-2026-42081
free5GC: UE Security Capability bypass on NGAP PathSwitchReq - CVE-2026-42082
free5GC: Missing Concurrent NAS SMC Validation During NGAP H - CVE-2026-42083
free5GC: PCF Npcf_SMPolicyControl missing authentication mid - CVE-2026-42459
free5GC: Improper Input Validation and Generation of Error M - CVE-2026-44315
free5GC: NEF 3gpp-pfd-management API is unauthenticated; for
Same weakness: CWE-306
- CVE-2026-46685
RustFS: Reflective CORS with credentials on S3 listener; una - CVE-2026-45044
RustFS: Authentication bypass in /profile/cpu and /profile/m - CVE-2026-45083
Goobi viewer: Unauthenticated Solr Streaming Expression Prox - CVE-2026-8364
Gladinet Triofox Missing Authentication for Critical Functio - CVE-2026-44320
free5GC: NEF nnef-callback route group is unauthenticated; f
V. Comments for CVE-2026-44321
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