CVE-2026-102716
HighCVSS 8.7Summary
An unauthenticated client can drain the RTSP server's packet pool with a few dozen requests carrying a Session header that the parser cannot convert. The Session branch returns a raw NetX error code instead of an RTSP status code, causing a response packet leak. After 26 requests the pool is exhausted and the server stops serving anyone.
Risk Assessment
An unauthenticated attacker can cause a denial of service (DoS) of the RTSP server, and if the packet pool is shared with the rest of the application, it can also halt other components. This results in service unavailability and potential environment instability.
Recommendation
Apply the vendor patch immediately, which converts the Session branch error to NX_RTSP_STATUS_CODE_BAD_REQUEST and releases the response packet on every exit path of _nx_rtsp_server_error_response_send. Until the patch is deployed, restrict RTSP server access to trusted clients only.
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Original NVD description (English source)
An unauthenticated client can drain the RTSP server's packet pool with a couple of dozen requests that carry a Session header the parser cannot convert. The Session branch returns the raw NetX error code instead of an RTSP status code: ```c /* addons/rtsp/nx_rtsp_server.c:2754 */ status = _nx_utility_string_to_uint(field_value_ptr, field_value_length, &session_id); if (status) { return(status); /* NX_INVALID_PARAMETERS / NX_SIZE_ERROR / NX_OVERFLOW */ } ``` Every other branch of the same function maps its failure to an RTSP status first. The CSeq branch eighteen lines earlier does exactly that (line 2736 returns NX_RTSP_STATUS_CODE_BAD_REQUEST). The raw code then reaches `_nx_rtsp_server_error_response_send` (nx_rtsp_server.c:1234), which does not recognise it, takes a path that returns without releasing the response packet it already allocated, and the block never goes back to the pool. Six requests with an empty Session header against a 22 packet pool: ``` valid requests: after request 6: pool available = 21, AFTER = 22 / 22 malformed requests: after request 6: pool available = 16, AFTER = 17 / 22 ``` One block per request, not returned when the client disconnects. Twenty six requests take the pool to zero and the server starts failing allocations, after which it serves nobody. If the pool is shared with the rest of the application, as it is in the shipped sample, the rest of the stack stops with it. Convert the `_nx_utility_string_to_uint` failure in the Session branch into NX_RTSP_STATUS_CODE_BAD_REQUEST the way the CSeq branch does, and release the response packet on every exit path of `_nx_rtsp_server_error_response_send`.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS