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Ubuntu 25.10: Tornado Critical XSS DoS Flaws USN-7950-1 CVE-2025-67724

ubuntu
Calendar Grey January 8, 2026
Dist Ubuntu Esm H88
Multiple Tornado security issues in Ubuntu fixed with immediate package updates required for safety. Key vulnerabilities detailed.
Several security issues were fixed in Tornado.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 25.04 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS 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 special characters in HTTP headers. An attacker could possibly use this issue to execute a cross- site scripting (XSS) attack. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10. (CVE-2025-67724) It was discovered that Tornado incorrectly handled repeated HTTP headers. An attacker could possibly use this issue to cause Tornado to use excessive resources, causing a denial of service. (CVE-2025-67725) It was discovered that Tornado incorrectly handled parsing of certain HTTP header values. An attacker could possibly use this issu...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical XSS Ubuntu python-tornado

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 python3-tornado 6.4.2-3ubuntu0.2 Ubuntu 25.04 python3-tornado 6.4.2-1ubuntu0.25.04.3 Ubuntu 24.04 LTS python3-tornado 6.4.0-1ubuntu0.4 Ubuntu 22.04 LTS python3-tornado 6.1.0-3ubuntu0.1~esm4 Available with Ubuntu Pro Ubuntu 20.04 LTS python3-tornado 6.0.3+really5.1.1-3ubuntu0.1~esm3 Available with Ubuntu Pro Ubuntu 18.04 LTS python-tornado 4.5.3-1ubuntu0.2+esm2 Available with Ubuntu Pro python3-tornado 4.5.3-1ubuntu0.2+esm2 Available with Ubuntu Pro Ubuntu 16.04 LTS python-tornado 4.2.1-1ubuntu3.1+esm2 Available with Ubuntu Pro python3-tornado 4.2.1-1ubuntu3.1+esm2 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7950-1

CVE-2025-67724, CVE-2025-67725, CVE-2025-67726

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7950-1

Topics%20covered

Topics Covered

security advisory denial of service critical XSS Ubuntu python-tornado

Package Information

https://launchpad.net/ubuntu/+source/python-tornado/6.4.2-3ubuntu0.2 https://launchpad.net/ubuntu/+source/python-tornado/6.4.2-1ubuntu0.25.04.3 https://launchpad.net/ubuntu/+source/python-tornado/6.4.0-1ubuntu0.4

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