Alerts This Week
Warning Icon 1 1,149
Alerts This Week
Warning Icon 1 1,149

Ubuntu 25.10 python-tornado Moderate Denial of Service USN-8198-1

ubuntu
Calendar Grey April 23, 2026
Dist Ubuntu Esm H88
Multiple security flaws fixed in Tornado for Ubuntu LTS versions including potential denial of service vulnerabilities.
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:

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 moderate denial of service update Ubuntu python-tornado

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  python3-tornado                 6.4.2-3ubuntu0.3

Ubuntu 24.04 LTS
  python3-tornado                 6.4.0-1ubuntu0.5

Ubuntu 22.04 LTS
  python3-tornado                 6.1.0-3ubuntu0.1~esm5
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  python3-tornado                 6.0.3+really5.1.1-3ubuntu0.1~esm5
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  python-tornado                  4.5.3-1ubuntu0.2+esm3
                                  Available with Ubuntu Pro
  python3-tornado                 4.5.3-1ubuntu0.2+esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  python-tornado                  4.2.1-1ubuntu3.1+esm3
                                  Available with Ubuntu Pro
  python3-tornado                 4.2.1-1ubuntu3.1+esm3
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8198-1

CVE-2026-31958, CVE-2026-35536

Ubuntu Security Notice USN-8198-1

Topics%20covered

Topics Covered

security advisory moderate denial of service update Ubuntu python-tornado

Package Information

https://launchpad.net/ubuntu/+source/python-tornado/6.4.2-3ubuntu0.3
https://launchpad.net/ubuntu/+source/python-tornado/6.4.0-1ubuntu0.5

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here