XX-Net up to 5.16.6 WebSocket Frame simple_http_server.py WebSocket_receive_worker improper validation of syntactic correctness of input

Summaryinfo

A vulnerability categorized as problematic has been discovered in XX-Net up to 5.16.6. This affects the function WebSocket_receive_worker of the file simple_http_server.py of the component WebSocket Frame Handler. Executing a manipulation can lead to improper validation of syntactic correctness of input. This vulnerability is registered as CVE-2026-10099. The attack needs to be launched locally. No exploit is available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in XX-Net up to 5.16.6. It has been declared as problematic. This vulnerability affects the function WebSocket_receive_worker of the file simple_http_server.py of the component WebSocket Frame Handler. The manipulation with an unknown input leads to a improper validation of syntactic correctness of input vulnerability. The CWE definition for the vulnerability is CWE-1286. The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax. As an impact it is known to affect integrity. CVE summarizes:

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.

The weakness was published by Yu Sun as 14169. The advisory is available at github.com. This vulnerability was named CVE-2026-10099 since 05/29/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Applying the patch 43aec6f is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

• XX-Net

Version

• 5.16.0
• 5.16.1
• 5.16.2
• 5.16.3
• 5.16.4
• 5.16.5
• 5.16.6

License

• open-source

Website

• Product: https://github.com/XX-net/XX-Net/

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