------------------------------------------------------------------------- Debian LTS Advisory DLA-4188-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Daniel Leidert May 29, 2025 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : python-tornado Version : 6.1.0-1+deb11u2 CVE ID : CVE-2025-47287 Debian Bug : 1105886 Tornado is a scalable, non-blocking Python web framework and asynchronous networking library. CVE-2025-47287 When Tornado's 'multipart/form-data' parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. For Debian 11 bullseye, this problem has been fixed in version 6.1.0-1+deb11u2. We recommend that you upgrade your python-tornado packages. For the detailed security status of python-tornado please refer to its security tracker page at: https://security-tracker.debian.org/tracker/python-tornado Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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