RHSA-2026:98104CriticalCVSS 7.5

Red Hat Security Advisory: python-tornado security update

Published
November 11, 2026
Last Modified
November 11, 2026

🔗 CVE IDs covered (3)

CVE-2024-14029 →CVE-2026-82397 →CVE-2023-54397 →

📋 Description

CVE-2023-54397 — python-tornado: Tornado before 6.3.3 HTTP Request Smuggling via Content-Length CVE-2024-14029 — python-tornado: Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding CVE-2026-82397 — python-tornado: Tornado: Denial of Service via excessive URL-encoded body fields

🎯 Affected products14

  • Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-0:4.2.1-5.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-0:4.2.1-5.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-0:4.2.1-5.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-0:4.2.1-5.el7_9.4.src as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-0:4.2.1-5.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-debuginfo-0:4.2.1-5.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-debuginfo-0:4.2.1-5.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-debuginfo-0:4.2.1-5.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-debuginfo-0:4.2.1-5.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-doc-0:4.2.1-5.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-doc-0:4.2.1-5.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-doc-0:4.2.1-5.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • python-tornado-doc-0:4.2.1-5.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Configure upstream reverse proxies or load balancers to strictly normalize or sanitize HTTP headers and reject malformed Content-Length headers before requests reach the Tornado application layer. Workaround: Configure upstream reverse proxies or load balancers to strictly normalize HTTP headers and reject any incoming requests containing duplicate Transfer-Encoding headers before they reach the backend Tornado application worker. Workaround: Restrict request payload sizes or maximum form field counts at an upstream web application firewall (WAF) or reverse proxy layer before HTTP requests reach the Tornado application worker.

🔗 References (6)