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Critical Tornado Vulnerabilities in Ubuntu Expose Sensitive Data

Critical Tornado Vulnerabilities in Ubuntu Expose Sensitive Data

First seen 22 Oct 2026, 19:43 UTC • •
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ThreatCluster AI
ThreatCluster •October 22, 2026 at 21:13 UTC
  • •Critical vulnerabilities in Tornado affect multiple Ubuntu versions.
  • •Attackers can exploit these flaws for denial of service and data exposure.
  • •Immediate system updates are necessary to mitigate risks.

On October 22, 2026, Ubuntu released an advisory regarding critical vulnerabilities in the Tornado web server, affecting multiple versions of python-tornado. These vulnerabilities (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE-2026-91992, CVE-2026-103262, CVE-2026-91990) could allow attackers to execute arbitrary code, cause denial of service, or expose sensitive information through specially crafted network traffic. The affected versions include python3-tornado 6.5.5-5ubuntu1.1 for Ubuntu 26.10 and earlier versions down to 16.04 LTS. Users are advised to update their systems to mitigate these risks. The vulnerabilities were published between September 15 and October 1, 2026, with critical CVSS scores of 9.0 and high scores of 8.2 and 8.7. A standard system update is recommended to apply the necessary patches.

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Timeline

2026-09-15
CVE-2023-54397 and others published
Multiple critical and high severity vulnerabilities in Tornado were disclosed, impacting various Ubuntu versions.
Linuxsecurity
2026-09-15
CVE-2024-14029 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-09-15
CVE-2026-91992 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-09-15
CVE-2026-91990 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-10-01
CVE-2026-103262 published
A new high severity vulnerability in Tornado was disclosed, adding to the existing vulnerabilities.
Linuxsecurity
2026-10-01
CVE-2026-103263 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-10-22
Ubuntu advisory released
Ubuntu issued a security notice regarding critical Tornado vulnerabilities, urging users to update their systems.
Ubuntu

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Common questions

Which versions of Tornado are affected?
Affected versions include python3-tornado 6.5.5-5ubuntu1.1 for Ubuntu 26.10 down to 4.2.1-1ubuntu3.1 for Ubuntu 16.04 LTS.
What are the risks associated with these vulnerabilities?
The vulnerabilities could allow attackers to execute arbitrary code, cause denial of service, or expose sensitive information.
How can I protect my systems?
Apply the recommended updates for your Ubuntu version as soon as possible to mitigate the vulnerabilities.