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Vulnerabilities CVE-2026-49854

CVE-2026-49854

Medium
Open
TLP:CLEAR

Tornado: Out-of-bounds memory access in C extension

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Description

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6.

Details

CVSS Score
5.3
EPSS Score
0.34%

26.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Confidence
90%
Published
Jul 14, 2026
Last Modified
Jul 15, 2026
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