CVE-2026-10099: Xx-Net

Medium severity, CVSS 4.0. EPSS: 0.1% chance of exploitation in the next 30 days.

XX-Net V5.16.6 contains a WebSocket frame parsing vulnerability in the WebSocket_receive_worker routine of simple_http_server.py that allows attackers to cause corrupted application data by sending unmasked WebSocket frames. The server unconditionally reads 4 bytes as a masking key regardless of whether the MASK bit is set in the frame header, causing the first 4 bytes of payload to be consumed as a mask key and the remaining payload to be incorrectly XOR-decoded, resulting in data corruption alongside missing RSV bit, opcode, and FIN fragmentation validations.

Affected products

• Xx-Net Xx-Net

Published 2026-05-29. Last modified 2026-10-06.