Ubuntu USN · USN-8198-2

Tornado vulnerabilities

Published: Tue, 28 Apr 2026 19:27

CVE-2026-35536CVE-2026-31958

Summary

Several security issues were fixed in Tornado.

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)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu resolute

python-tornado→6.5.4-0.1ubuntu0.1apt_upgrade
Standard apt upgrade. Install 6.5.4-0.1ubuntu0.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-tornado
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-tornado-doc→6.5.4-0.1ubuntu0.1apt_upgrade
Standard apt upgrade. Install 6.5.4-0.1ubuntu0.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-tornado-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-tornado→6.5.4-0.1ubuntu0.1apt_upgrade
Standard apt upgrade. Install 6.5.4-0.1ubuntu0.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-tornado
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8198-2?

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