CVE-2026-10099

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.

CVSS v3 4.0 MEDIUM

4.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/XX-net/XX-Net/commit/a68b972a84ed6e52df9f30237cf47493b9231b53
https://github.com/XX-net/XX-Net/issues/14169
https://github.com/XX-net/XX-Net/pull/14170
https://www.vulncheck.com/advisories/xx-net-websocket-frame-parsing-data-corruption-via-simple-http-server-py

Configurations

No configuration.

History

29 May 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-29 16:16

Updated : 2026-06-01 18:12

NVD link : CVE-2026-10099

Mitre link : CVE-2026-10099

CVE.ORG link : CVE-2026-10099

JSON object : View

Products Affected

No product.

CWE

CWE-1286

Improper Validation of Syntactic Correctness of Input

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