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CVE-2026-40245— Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

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，该漏洞源于中GET请求处理程序在缺少必要参数时未正确返回，导致继续执行并泄露包含SUPI/IMSI值的流量影响订阅列表，未经身份验证的攻击者可通过网络访问获取存储的订阅者标识符。

CVSS 7.5 · High EPSS 0.56% · P45
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I. Basic Information for CVE-2026-40245

Vulnerability Information
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Vulnerability Title
Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication
Source: CVE Program / CVE List V5
Vulnerability Description
Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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，该漏洞源于中GET请求处理程序在缺少必要参数时未正确返回，导致继续执行并泄露包含SUPI/IMSI值的流量影响订阅列表，未经身份验证的攻击者可通过网络访问获取存储的订阅者标识符。
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-2026-40245

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III. Intelligence Information for CVE-2026-40245

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Vendor Advisories for CVE-2026-40245 (1)

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-200

V. Comments for CVE-2026-40245

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