Update dependency tornado to v6.5.6 [SECURITY]#5264
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This PR contains the following updates:
6.5.5→6.5.6Tornado has out-of-bounds memory access via C extension
CVE-2026-49854 / GHSA-cx3h-4qpv-8hc9
More information
Details
Summary
Tornado's optional native extension
tornado.speedupsimplementswebsocket_maskwithout validating that themaskargument is exactly four bytes long. The C function reads four bytes frommaskunconditionally, even when Python passes a shorter byte string. This can read beyond the provided buffer, exposing up to 3 bytes of uninitialized memory.The behavior is reachable from Tornado's XSRF token decoder when
xsrf_cookies=Trueand the native extension is active.Mitigations
This bug is fixed in Tornado 6.5.6. Prior to upgrading to this version, setting the environment variable TORNADO_EXTENSION=0 will disable the vulnerable code (at the expense of reducing websocket performance).
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
tornadoweb/tornado (tornado)
v6.5.6Compare Source
Configuration
📅 Schedule: (UTC)
🚦 Automerge: Enabled.
♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
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