Improper Handling of Highly Compressed Data (Data Amplification) Affecting python3-tornado package, versions <0:6.5.8-0.el10_2.1


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.61% (47th percentile)

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  • Snyk IDSNYK-ORACLE10-PYTHON3TORNADO-19786645
  • published14 Sept 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 Oracle:10 python3-tornado to version 0:6.5.8-0.el10_2.1 or higher.
This issue was patched in ELSA-2026-67147-0.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-tornado package and not the python3-tornado package as distributed by Oracle. See How to fix? for Oracle:10 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