CVE-2026-40247

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 reading 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 data is returned alongside the 404 response. An unauthenticated attacker with access to the 5G Service Based Interface can read arbitrary Traffic Influence Subscriptions, including SUPIs/IMSIs, DNNs, S-NSSAIs, and callback URIs, by supplying any value for the influenceId path segment. A patched version was not available at the time of publication.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/security/advisories/GHSA-x5r2-r74c-3w28	Exploit Third Party Advisory Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

History

21 Apr 2026, 13:53

Type	Values Removed	Values Added
References	~~() https://github.com/free5gc/free5gc/security/advisories/GHSA-x5r2-r74c-3w28 -~~	() https://github.com/free5gc/free5gc/security/advisories/GHSA-x5r2-r74c-3w28 - Exploit, Third Party Advisory, Mitigation
CPE		cpe:2.3:a:free5gc:free5gc::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
First Time		Free5gc free5gc Free5gc

16 Apr 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-16 22:16

Updated : 2026-04-21 13:53

NVD link : CVE-2026-40247

Mitre link : CVE-2026-40247

CVE.ORG link : CVE-2026-40247

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-285

Improper Authorization

CWE-636

Not Failing Securely ('Failing Open')

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