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Ubuntu 26.04 LTS USN-8198-2 Tornado Important Denial of Service

ubuntu
Calendar Grey April 28, 2026
Dist Ubuntu Esm H88
Stay protected: Ubuntu 26.04 LTS Tornado update fixes critical security flaws. Ensure your system is updated to avoid risks.
Several security issues were fixed in Tornado.

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)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important cookie injection tornado

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8198-2

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important cookie injection tornado

Package Information

https://launchpad.net/ubuntu/+source/python-tornado/6.5.4-0.1ubuntu0.1

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