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freerdp

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FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. Three PDU writers in libfreerdp/core/info.c (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) use Stream_Seek instead of Stream_Zero for reserved pad bytes (up to 576 bytes), leaving previously freed heap contents in the outgoing PDU. Because the send buffer is allocated with malloc (not zeroed), stale heap data — which may include cleartext credentials from prior sessions — can be sent to the receiving peer. FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy (which forwards these PDUs) are affected, allowing disclosure of server/proxy process memory to a downstream client.

FreeRDP versions 3.0.0 through 3.30.0 transmit uninitialized heap memory in the Save Session Info PDU reserved padding fields due to improper handling of reserved pad bytes in three PDU writers (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) within libfreerdp/core/info.c. These functions use Stream_Seek instead of Stream_Zero, leaving up to 576 bytes of previously freed heap data in the outgoing PDU. Since the send buffer is allocated with malloc and not zeroed, stale heap contents, which may include cleartext credentials from prior sessions, can be leaked to the receiving peer. This affects FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy forwarding these PDUs, allowing disclosure of server or proxy process memory to downstream clients. The vulnerability is tracked as CVE-2026-85089 and has a CVSS 3.1 base score of 6.5 (medium severity). A patch is available in FreeRDP version 3.31.0.

Detailed information about FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fi

FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. (CVE-2026-85089) - Live Threat Intelligence - Threat Radar | OffSeq.com

FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. (CVE-2026-85089)

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