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EUVD-2026-291562

fkie_cve-2026-40245

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.

GHSA-wrwh-rpq4-87hf — free5gc UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

Affected: Go: github.com/free5gc/udr

### Summary An information disclosure vulnerability in the UDR service allows any unauthenticated attacker with access to the 5G Service Based Interface (SBI) to retrieve stored subscriber identifiers (SUPI/IMSI) with a single HTTP GET request requiring no parameters or credentials.

### Details The endpoint `GET /nudr-dr/v2/application-data/influenceData/subs-to-notify` (defined in 3GPP TS 29.519) requires at least one query parameter (`dnns`, `snssais`, `supis`, or `internalGroupIds`) to filter results.

In the free5GC UDR implementation, the input validation is present but ineffective because the handler does not return after sending the HTTP 400 error. The request handling flow is:

1. The function `HandleApplicationDataInfluenceDataSubsToNotifyGet` in `./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/api_datarepository.go` (around line 2793) checks whether all of `dnn`, `snssai`, `internalGroupId`, and `supi` are empty. 2. If they are all empty, it builds a `problemDetails` structure and calls `c.JSON(http.StatusBadRequest, problemDetails)` to send a 400 response, **but it does not return afterwards**. 3. Execution continues and the handler still calls `s.Processor().ApplicationDataInfluenceDataSubsToNotifyGetProcedure(c, dnn,snssai, internalGroupId, supi)` defined in `./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/processor/influence_data_subscriptions_collection.go`. 4. This processor function queries the data repository and writes the full list of Traffic Influenc…