RHSA-2026:80741 - Security Advisory

Topic

An update for python-tornado is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. 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):

• tornado: Tornado: Information disclosure via improper handling of credentials during HTTP redirects (CVE-2026-49853)
• tornado: Tornado: Denial of Service via uncontrolled gzip decompression memory consumption (CVE-2026-49855)
• tornado: Tornado: Denial of Service via memory amplification in multipart parsing (CVE-2026-91990)

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 for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2500672 - CVE-2026-49853 tornado: Tornado: Information disclosure via improper handling of credentials during HTTP redirects
• BZ - 2500686 - CVE-2026-49855 tornado: Tornado: Denial of Service via uncontrolled gzip decompression memory consumption
• BZ - 2533953 - CVE-2026-91990 tornado: Tornado: Denial of Service via memory amplification in multipart parsing

CVEs

• CVE-2026-49853
• CVE-2026-49855
• CVE-2026-82397
• CVE-2026-91990

References

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