RHSA-2026:67147HighCVSS 7.7

Red Hat Security Advisory: python-tornado security update

Published
September 14, 2026
Last Modified
September 14, 2026

🔗 CVE IDs covered (2)

CVE-2026-49853 →CVE-2026-49855 →

📋 Description

CVE-2026-49853 — tornado: Tornado: Information disclosure via improper handling of credentials during HTTP redirects CVE-2026-49855 — tornado: Tornado: Denial of Service via uncontrolled gzip decompression memory consumption

🎯 Affected products14

  • Red Hat Enterprise Linux AppStream (v. 10)
  • python-tornado-0:6.5.8-0.el10_2.1.src as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python-tornado-debugsource-0:6.5.8-0.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python-tornado-debugsource-0:6.5.8-0.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python-tornado-debugsource-0:6.5.8-0.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python-tornado-debugsource-0:6.5.8-0.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-0:6.5.8-0.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-0:6.5.8-0.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-0:6.5.8-0.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-0:6.5.8-0.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-debuginfo-0:6.5.8-0.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-debuginfo-0:6.5.8-0.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-debuginfo-0:6.5.8-0.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-tornado-debuginfo-0:6.5.8-0.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)

✅ 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: Applications utilizing Tornado's SimpleAsyncHTTPClient can mitigate this issue by explicitly disabling automatic redirection following. This can be achieved by setting `follow_redirects=False` when making HTTP requests. Manually handling redirects allows applications to ensure sensitive headers are not inadvertently sent to unintended origins. Disabling automatic redirects may alter application behavior that relies on this feature. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

🔗 References (3)