CVE-2026-64621

FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated through the settings object, and a raw non-owning pointer to it is freed on the strtoul error path without clearing settings->MonitorIds, leaving it dangling; at teardown freerdp_settings_free() frees the same buffer again. An attacker who convinces a victim to open a crafted .rdp file with oversized monitor tokens can trigger a size-controlled double-free in any FreeRDP CLI client (xfreerdp/sdl-freerdp/wlfreerdp) in the default configuration.

• github.comhttps://github.com/FreeRDP/FreeRDP/commit/1f7a716d39b5605bb8a83b0c3c97a6ce386609ef
• github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc
• www.vulncheck.comhttps://www.vulncheck.com/advisories/freerdp-before-double-free-via-selectedmonitors
• github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc