CVE-2026-40245 (GCVE-0-2026-40245)
Vulnerability from cvelistv5
Published
2026-04-15 23:25
Modified
2026-04-16 12:04
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-202 - Exposure of Sensitive Information Through Data Queries
  • CWE-209 - Generation of Error Message Containing Sensitive Information
Summary
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.
Impacted products
Vendor Product Version
free5gc free5gc Version: <= 1.4.2
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Show details on NVD website


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