[USN-8198-2] Tornado vulnerabilities

========================================================================== Ubuntu Security Notice USN-8198-2 April 28, 2026 python-tornado vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS Summary: Several security issues were fixed in Tornado. Software Description: - 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 26.04 LTS python3-tornado 6.5.4-0.1ubuntu0.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8198-2 https://ubuntu.com/security/notices/USN-8198-1 CVE-2026-31958, CVE-2026-35536 Package Information: https://launchpad.net/ubuntu/+source/python-tornado/6.5.4-0.1ubuntu0.1