Improper Handling of Highly Compressed Data (Data Amplification) Affecting python-tornado-doc package, versions <0:6.1.0-2.amzn2023.0.9


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.57% (44th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHONTORNADODOC-18532335
  • published5 Aug 2026
  • disclosed14 Jul 2026

Introduced: 14 Jul 2026

CVE-2026-49855  (opens in a new tab)
CWE-409  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python-tornado-doc to version 0:6.1.0-2.amzn2023.0.9 or higher.
This issue was patched in ALAS2023-2026-2016.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-tornado-doc package and not the python-tornado-doc package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1