CVE-2026-49855

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.5 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

June 15, 2026

Last Modified

July 16, 2026

CWE ID

CWE-409

Source

GitHub

Vendor

pip

Product

tornado

External References

https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56
https://github.com/advisories/GHSA-mgf9-4vpg-hj56

CVE-2026-49855

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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