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CVE-2026-55068— free5GC: NRF nnrf-nfm lacks NF Profile input validation — enables NF Registration Poisoning with arbitrary service endpoints

Quick assessment

Affected
free5gc free5gc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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团队开源的一个第 5 代 (5G) 移动核心网络的项目平台。 free5GC 4.2.2及之前版本存在输入验证错误漏洞，该漏洞源于NRF的RegisterNFInstance处理程序接受NF配置文件时未对UUID格式、nfStatus枚举值、heartBeatTimer范围、必填字段及nfServices.ipEndPoints地址约束进行有效验证，可能导致具有SBI访问权限的攻击者发布攻击者控制的网络功能端点并重定向控制平面信令，从而造成凭据和信令泄露、服务发现完整性被破坏

CVSS 9.3 · Critical EPSS 0.59% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
free5gc free5gc < 4.2.3 affected
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I. Basic Information for CVE-2026-55068

Vulnerability Information
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Vulnerability Title
free5GC: NRF nnrf-nfm lacks NF Profile input validation — enables NF Registration Poisoning with arbitrary service endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC is an open-source implementation of the 5G core network. In 4.2.2 and earlier, the NRF RegisterNFInstance handler at PUT /nnrf-nfm/v1/nf-instances/{nfInstanceID} accepts NF Profiles without enforcing UUID format, nfStatus enum values, heartBeatTimer ranges, mandatory profile fields, or nfServices.ipEndPoints address constraints. The invalid profiles are persisted in the MongoDB NfProfile collection and returned by NFDiscover, allowing an attacker with SBI access to advertise attacker-controlled network-function endpoints and redirect control-plane signaling. This can expose credentials and signaling, alter service discovery integrity, and deny service across network functions that trust the NRF. This issue is fixed in version 4.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
free5GC 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC团队开源的一个第 5 代 (5G) 移动核心网络的项目平台。 free5GC 4.2.2及之前版本存在输入验证错误漏洞，该漏洞源于NRF的RegisterNFInstance处理程序接受NF配置文件时未对UUID格式、nfStatus枚举值、heartBeatTimer范围、必填字段及nfServices.ipEndPoints地址约束进行有效验证，可能导致具有SBI访问权限的攻击者发布攻击者控制的网络功能端点并重定向控制平面信令，从而造成凭据和信令泄露、服务发现完整性被破坏
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 < 4.2.3 -

II. Public POCs for CVE-2026-55068

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III. Intelligence Information for CVE-2026-55068

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Patches & Fixes for CVE-2026-55068 (2)

Vendor Advisories for CVE-2026-55068 (1)

Vendor Pages for CVE-2026-55068 (2)

Other References for CVE-2026-55068 (1)

Same Patch Batch · free5gc · 2026-08-28 · 3 CVEs total

CVE-2026-55784 7.5 HIGH free5GC AUSF authentication contexts can be overwritten by concurrent requests for the sam
CVE-2026-55785 3.7 LOW free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-20

V. Comments for CVE-2026-55068

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