RHSA-2026:95082 - Security Advisory

Topic

An update for python3 is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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):

• python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio() (CVE-2026-19553)
• python: Use-after-free of a server-side SSLContext when sni_callback switches contexts (CVE-2026-19445)

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 Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2544127 - CVE-2026-19553 python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio()
• BZ - 2544138 - CVE-2026-19445 python: Use-after-free of a server-side SSLContext when sni_callback switches contexts

CVEs

• CVE-2026-19445
• CVE-2026-19553

References

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