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CVE-2026-27642— free5GC has Improper Input Validation in UDM UEAU Service

Quick assessment

Affected
free5gc udm
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 1.4.1及之前版本存在输入验证错误漏洞，该漏洞源于supi参数中可注入控制字符，可能导致系统级错误详情泄露。

AI Predicted 5.3 Difficulty: Easy EPSS 0.65% · P49
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I. Basic Information for CVE-2026-27642

Vulnerability Information
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Vulnerability Title
free5GC has Improper Input Validation in UDM UEAU Service
Source: CVE Program / CVE List V5
Vulnerability Description
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, remote attackers can inject control characters (e.g., %00) into the supi parameter, triggering internal URL parsing errors (net/url: invalid control character). This exposes system-level error details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UEAU service may be affected. free5gc/udm pull request 75 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
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开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 1.4.1及之前版本存在输入验证错误漏洞，该漏洞源于supi参数中可注入控制字符，可能导致系统级错误详情泄露。
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 udm <= 1.4.1 -

II. Public POCs for CVE-2026-27642

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III. Intelligence Information for CVE-2026-27642

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Same Patch Batch · free5gc · 2026-02-24 · 6 CVEs total

CVE-2026-26025 free5GC SMF crash (nil pointer dereference) on PFCP SessionReportRequest when ReportType.U
CVE-2026-26024 free5GC SMF crash (nil pointer dereference) on PFCP SessionReportRequest when ReportType.U
CVE-2026-25501 free5GC SMF crash (nil pointer dereference) on PFCP SessionReportRequest when ReportType.D
CVE-2026-27643 free5GC has improper error handling in NEF with information exposure
CVE-2025-69253 free5GC vulnerable to improper error handling in NEF with information exposure

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-27642

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