Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. Version 6.4.2 fixes the issue.
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2024:10590 https://access.redhat.com/errata/RHSA-2024:10590
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Extended Update Support Via RHSA-2024:10836 https://access.redhat.com/errata/RHSA-2024:10836
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2024:10843 https://access.redhat.com/errata/RHSA-2024:10843
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:2471 https://access.redhat.com/errata/RHSA-2025:2471
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2025:2470 https://access.redhat.com/errata/RHSA-2025:2470
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2025:2550 https://access.redhat.com/errata/RHSA-2025:2550
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2025:2872 https://access.redhat.com/errata/RHSA-2025:2872
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Telecommunications Update Service Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions Via RHSA-2025:2955 https://access.redhat.com/errata/RHSA-2025:2955
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat Enterprise Linux 8.6 Telecommunications Update Service Via RHSA-2025:2956 https://access.redhat.com/errata/RHSA-2025:2956
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Extended Update Support Via RHSA-2025:3109 https://access.redhat.com/errata/RHSA-2025:3109
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Extended Update Support Via RHSA-2025:3108 https://access.redhat.com/errata/RHSA-2025:3108