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EUVD-2026-291881

2026-10-06T01:00:44.722068+00:00

EUVD-2026-291881

fkie_cve-2026-40249

2026-10-06T01:00:44.722111+00:00

free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the PUT handler for updating Policy Data notification subscriptions at /nudr-dr/v2/policy-data/subs-to-notify/{subsId} does not return after request body retrieval or deserialization errors. Although HTTP 500 or 400 error responses are sent, execution continues and the processor is invoked with a potentially uninitialized or partially initialized PolicyDataSubscription object. This fail-open behavior may allow unintended modification of existing Policy Data notification subscriptions with invalid or empty input, depending on downstream processor and storage behavior. A patched version was not available at the time of publication.

GHSA-gx38-8h33-pmxr — free5gc UDR fail-open request handling in PolicyDataSubsToNotifySubsIdPut may allow unintended subscription updates aft…

2026-10-06T01:00:44.722149+00:00

Affected: Go: github.com/free5gc/udr

### Summary A fail-open request handling flaw in the UDR service causes the `/nudr-dr/v2/policy-data/subs-to-notify/{subsId}` PUT handler to continue processing requests even after request body retrieval or deserialization errors.

This may allow unintended modification of existing Policy Data notification subscriptions with invalid, empty, or partially processed input, depending on downstream processor behavior.

### Details The endpoint `PUT /nudr-dr/v2/policy-data/subs-to-notify/{subsId}` is intended to update an existing Policy Data notification subscription only after the HTTP request body has been successfully read and parsed into a valid `PolicyDataSubscription` object. [file:93]

In the free5GC UDR implementation, the function `HandlePolicyDataSubsToNotifySubsIdPut` in`NFs/udr/internal/sbi/api_datarepository.go` does not terminate execution after input-processing failures. [file:93]

The request flow is:

1. The handler calls `c.GetRawData()` to read the HTTP request body. [file:93] 2. If `GetRawData()` fails, the handler sends an HTTP 500 error response, but **does not return**. [file:93] 3. The handler then calls `openapi.Deserialize(policyDataSubscription, reqBody, "application/json")`. [file:93] 4. If deserialization fails, the handler sends an HTTP 400 error response, but again **does not return**. [file:93] 5. Execution continues and the handler still invokes `s.Processor().PolicyDataSubsToNotifySubsIdPutProcedure(c, subsId, policyDataSubscription)`. [file:93]…