CVE-2026-10099
MediumCVSS 4.0Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In XX-Net version 5.16.6, a WebSocket frame parsing vulnerability exists in the WebSocket_receive_worker function. The server always reads 4 bytes as a masking key regardless of the MASK flag, leading to data corruption and missing validations.
Risk Assessment
Risk includes application data corruption and potential compromise of WebSocket communication integrity.
Recommendation
Update XX-Net to a version later than 5.16.6 and implement proper WebSocket frame validations.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

