Detections
Analytics
CVE-2026-49855
high
Description
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.
References
https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56
https://github.com/tornadoweb/tornado/pull/3626
https://github.com/tornadoweb/tornado/commit/ff808b33adc52d89a549376a5e3628e92abbc8ff