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CVE-2026-64621 is a double-free vulnerability in FreeRDP before 3.28.0, affecting 3.x releases through 3.27.1. The flaw is in freerdp_client_rdp_file_apply_to_settings() in client/common/file.c while parsing the selectedmonitors field of an .rdp connection file. During error handling on a strtoul conversion failure, a raw non-owning pointer to the MonitorIds array is freed even though ownership remains with the settings object, and settings->MonitorIds is not cleared. This leaves a dangling pointer that is later freed again during freerdp_settings_free(), resulting in a double-free condition. The issue can be triggered by a crafted .rdp file containing oversized monitor tokens and affects FreeRDP CLI clients including xfreerdp, sdl-freerdp, and wlfreerdp in default configurations.
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