CVE-2026-49854

Published: Jul 14, 2026Modified: Jul 15, 2026Deferred

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitability: 3.9 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-126

Buffer Over-read

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

References (4)

https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac

Source: security-advisories@github.com

https://github.com/tornadoweb/tornado/pull/3626

Source: security-advisories@github.com

https://github.com/tornadoweb/tornado/releases/tag/v6.5.6

Source: security-advisories@github.com

https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9

Source: security-advisories@github.com

Timeline

No history available yet.