CVE-2026-67298 - FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow

CVE-2026-67298 - FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/01/2026 - 16:08
CVE ID :CVE-2026-67298
Published : Aug. 1, 2026, 12:22 p.m. | 31 minutes ago
Description :FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAIL channel handler (rail_server_handle_messages() in channels/rail/server/rail_main.c). When processing a RAIL PDU header, the code subtracts RAIL_PDU_HEADER_LENGTH from the peer-controlled orderLength field without first verifying orderLength is at least the header length. For orderLength values 0..3 this causes an unsigned integer underflow to a very large size, which bypasses the Stream_EnsureRemainingCapacity() capacity check (due to pointer arithmetic wraparound) and is then passed to WTSVirtualChannelRead(), resulting in an out-of-bounds heap write. A malicious or compromised RDP client can exploit this to corrupt the heap and crash the server. Fixed in FreeRDP 3.29.0.
Severity: 8.7 | HIGH
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