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.

The following products are affected by CVE-2026-40247 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40247.

URL	Resource
https://github.com/free5gc/free5gc/security/advisories/GHSA-x5r2-r74c-3w28