ESB-2026.3215

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3215 python-tornado security update 2 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: python-tornado Publisher: Debian Operating System: Debian GNU/Linux Resolution: Patch/Upgrade CVE Names: CVE-2026-31958 Original Bulletin: https://lists.debian.org/debian-lts-announce/2026/04/msg00000.html Comment: CVSS (Max): 7.5 CVE-2026-31958 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: NIST Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 0.0% (6th) CVE-2026-31958 2026-04-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4520-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Daniel Leidert April 01, 2026 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : python-tornado Version : 6.1.0-1+deb11u4 CVE ID : CVE-2026-31958 Debian Bug : 1130507 1132367 Tornado is a scalable, non-blocking Python web framework and asynchronous networking library. CVE-2026-31958 Introduce new limits on the size and complexity of multipart bodies, including a default limit of 100 parts per request to mitigate a possible DoS. It is also possible to disable parsing multipart/form- data entirely if not required GHSA-78cv-mqj4-43f7 (CVE not available yet) Values passed to the domain, path, and samesite arguments of RequestHandler.set_cookie are not completely validated. In particular, semicolons are allowed, which could be used to inject attacker-controlled values for other cookie attributes. For Debian 11 bullseye, this problem has been fixed in version 6.1.0-1+deb11u4. 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 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================