RHSA-2026:98104 - Security Advisory

Topic

An update for python-tornado is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

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

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 2526562 - CVE-2026-82397 python-tornado: Tornado: Denial of Service via excessive URL-encoded body fields
• BZ - 2533918 - CVE-2024-14029 python-tornado: Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding
• BZ - 2533932 - CVE-2023-54397 python-tornado: Tornado before 6.3.3 HTTP Request Smuggling via Content-Length

CVEs

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

References

• https://access.redhat.com/security/updates/classification/#critical