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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-tornadoUpgrade python3-tornado-docUpgrade python-tornado-debuginfoUpgrade python3-tornado-debuginfoUpgrade python3-tornadoUpgrade python-tornado-doc | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-tornadoUpgrade python3-tornado-debuginfoUpgrade python-tornado-docUpgrade python3.13-tornado-debuginfoUpgrade python3.13-tornado-debugsourceUpgrade python-tornado-debugsourceUpgrade python3.13-tornadoUpgrade python3.13-tornado-doc | Aug 10, 2026 | Jul 14, 2026 |
| Redhat_linux | — | No solution exists | Jul 20, 2026 | Jul 14, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 6, 2026 | Jul 14, 2026 |
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