ESB-2026.4380

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4380 USN-8198-2: Tornado vulnerabilities 29 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Tornado Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-31958 CVE-2026-35536 Original Bulletin: https://ubuntu.com/security/notices/USN-8198-2 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: Ubuntu, [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): 0.1% (15th) CVE-2026-35536 2026-04-28 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8198-2: Tornado vulnerabilities Publication date 28 April 2026 Overview Several security issues were fixed in Tornado. Releases 26.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o python-tornado - scalable, non-blocking web server and tools Details USN-8198-1 fixed vulnerabilities in Tornado. This update provides the corresponding updates for Ubuntu 26.04 LTS. Original advisory details: It was discovered that Tornado incorrectly handled parsing of large multipart request bodies. An attacker could possibly use this issue to cause a denial of service. ( CVE-2026-31958 ) It was discovered that Tornado did not properly validate characters in cookie values. An attacker could possibly use this issue to inject arbitrary cookie attributes. ( CVE-2026-35536 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute python3-tornado - 6.5.4-0.1ubuntu0.1 --------------------------------------------------------------------------------- References o CVE-2026-35536 o CVE-2026-31958 Related notices o USN-8198-1 - --------------------------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 ===========================================================================