CVE-2026-10099
XX-Net V5.16.6 WebSocket Frame Parsing Data Corruption via simple_http_server.py
CVSS Score
4.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1286 |
| Vendor | xx-net |
| Product | xx-net |
| Published | May 29, 2026 |
| Last Updated | Jun 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
XX-net / XX-Net
0 ≤ 5.16.6 0 ≤ 43aec6f
References
github.com: https://github.com/XX-net/XX-Net/issues/14169 github.com: https://github.com/XX-net/XX-Net/pull/14170 github.com: https://github.com/XX-net/XX-Net/commit/a68b972a84ed6e52df9f30237cf47493b9231b53 vulncheck.com: https://www.vulncheck.com/advisories/xx-net-websocket-frame-parsing-data-corruption-via-simple-http-server-py
Credits
YU SUN