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CVE-2026-44328— free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating

Quick assessment

Affected
free5gc free5gc
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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的DELETE处理程序无条件取消引用UPF对象，可能导致单个未认证请求触发空指针panic并改变内存拓扑。

CVSS 8.2 · High EPSS 0.54% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
free5gc free5gc < 4.2.2 affected
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I. Basic Information for CVE-2026-44328

Vulnerability Information
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Vulnerability Title
free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating
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. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. 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:L/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的DELETE处理程序无条件取消引用UPF对象，可能导致单个未认证请求触发空指针panic并改变内存拓扑。
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

Vendor Product Affected Versions CPE Subscribe
free5gc free5gc < 4.2.2 -

II. Public POCs for CVE-2026-44328

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Qwen3.6-35B-A3B · 5523 chars
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III. Intelligence Information for CVE-2026-44328

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Patches & Fixes for CVE-2026-44328 (3)

Vendor Advisories for CVE-2026-44328 (1)

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-2026-44325 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-2026-44321 7.5 HIGH free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (
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
Same vendor: free5gc
Same weakness: CWE-306

V. Comments for CVE-2026-44328

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