CVE-2026-63652
HighCVSS 7.1Summary
In FreeRDP before 3.28.0, rdpsnd_server_recv_formats frees context->client_formats on a malformed Client Audio Formats PDU without clearing the pointer or count. An authenticated RDP client can trigger an error, leaving a dangling pointer, leading to a double-free at session teardown. This can crash the server and cause heap corruption.
Risk Assessment
A malicious RDP client can crash the server, disrupting service availability, and potentially cause memory corruption.
Recommendation
Update FreeRDP to version 3.28.0 or later, which includes the fix.
Original NVD description (English source)
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation again at session teardown. This reliably terminates the server and can create allocator-dependent heap corruption. This issue is fixed in version 3.28.0.