Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-49855: 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. CVE-2026-49854: 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. CVE-2026-49853: Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.
Fixed packages 4
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | python3.13-tornado | 0:6.4.2-1.amzn2023.0.4 |
| Amazon Linux · 2023 | python3.13-tornado-debuginfo | 0:6.4.2-1.amzn2023.0.4 |
| Amazon Linux · 2023 | python3.13-tornado-debugsource | 0:6.4.2-1.amzn2023.0.4 |
| Amazon Linux · 2023 | python3.13-tornado-doc | 0:6.4.2-1.amzn2023.0.4 |
Vulnerabilities 3
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High 7.7
Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when …
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High 7.5
tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)
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 acces…
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Medium 5.3
Tornado: Out-of-bounds memory access in C extension
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 u…