Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in version 6.5.6.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade python3-tornado | Oct 11, 2026 | Sep 14, 2026 |
| Amazon Linux Ami 2 | — | Upgrade python-tornadoUpgrade python3-tornado-debuginfoUpgrade python3-tornadoUpgrade python3-tornado-docUpgrade python-tornado-debuginfoUpgrade python-tornado-doc | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-tornado-debuginfoUpgrade python-tornado-debugsourceUpgrade python-tornado-docUpgrade python3.13-tornado-debuginfoUpgrade python3.13-tornado-docUpgrade python3-tornadoUpgrade python3.13-tornado-debugsourceUpgrade python3.13-tornado | Aug 10, 2026 | Jul 14, 2026 |
| Redhat_linux | — | Upgrade python3-tornadoNo solution existsUpgrade python-tornado-debugsourceUpgrade python3-tornado-debuginfo | Sep 3, 2026 | Jul 14, 2026 |
| Rocky_linux | — | Upgrade python3-tornadoUpgrade python3-tornado-debuginfo | Sep 17, 2026 | Sep 15, 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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