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CVE-2026-40248— free5gc UDR improper path validation allows unauthenticated creation and modification of Traffic Influence Subscriptions

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开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 4.2.1及之前版本存在安全漏洞，该漏洞源于UDR服务中创建或更新流量影响订阅的处理程序在验证失败后未正确返回，导致继续执行并创建或覆盖订阅，未经身份验证的攻击者可通过访问5G服务接口创建或覆盖包含攻击者控制通知URI和任意SUPI的流量影响订阅。

AI Predicted 9.8 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40248

Vulnerability Information
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Vulnerability Title
free5gc UDR improper path validation allows unauthenticated creation and modification of Traffic Influence Subscriptions
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for creating or updating Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but does not return after sending the HTTP 404 response when validation fails. Execution continues and the subscription is created or overwritten regardless. An unauthenticated attacker with access to the 5G Service Based Interface can create or overwrite arbitrary Traffic Influence Subscriptions, including injecting attacker-controlled notificationUri values and arbitrary SUPIs, by supplying any value for the influenceId path segment. A patched version was not available at the time of publication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
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 4.2.1及之前版本存在安全漏洞，该漏洞源于UDR服务中创建或更新流量影响订阅的处理程序在验证失败后未正确返回，导致继续执行并创建或覆盖订阅，未经身份验证的攻击者可通过访问5G服务接口创建或覆盖包含攻击者控制通知URI和任意SUPI的流量影响订阅。
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 <= 1.4.2 -

II. Public POCs for CVE-2026-40248

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III. Intelligence Information for CVE-2026-40248

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Vendor Advisories for CVE-2026-40248 (1)

Same Patch Batch · free5gc · 2026-04-16 · 4 CVEs total

CVE-2026-40247 free5gc UDR improper path validation allows unauthenticated access to Traffic Influence Su
CVE-2026-40249 free5gc UDR fail-open request handling in PolicyDataSubsToNotifySubsIdPut may allow uninte
CVE-2026-40246 free5gc UDR improper path validation allows unauthenticated deletion of Traffic Influence

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-285

V. Comments for CVE-2026-40248

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