Out-of-bounds Read Affecting python3.13-tornado-debuginfo package, versions <0:6.4.2-1.amzn2023.0.4


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.34% (27th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON313TORNADODEBUGINFO-18530381
  • published5 Aug 2026
  • disclosed14 Jul 2026

Introduced: 14 Jul 2026

NewCVE-2026-49854  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3.13-tornado-debuginfo to version 0:6.4.2-1.amzn2023.0.4 or higher.
This issue was patched in ALAS2023-2026-2015.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.13-tornado-debuginfo package and not the python3.13-tornado-debuginfo 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, 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.

CVSS Base Scores

version 3.1