A vulnerability (CVE-2025-66471, CVSS 7.5 HIGH) in the python-urllib3 Streaming API allows improper handling of highly compressed data. The NVD data indicates affected versions are python-urllib3 >= 1.0 and < 2.6.0, and the fixed version is 2.6.0. Red Hat has issued an Important-rated update with patched packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support.
Red Hat Product Errata RHSA-2026:9031 - Security Advisory Issued: 2026-04-20 Updated: 2026-04-20 RHSA-2026:9031 - Security Advisory Overview Updated Packages Synopsis Important: python-urllib3 security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for python-urllib3 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 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): urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471) 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 - 2419467 - CVE-2025-66471 urllib3: urllib3 Streaming API improperly handles highly compressed data CVEs CVE-2025-66471 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 SRPM python-urllib3-1.10.2-7.el7_9.1.src.rpm SHA-256: 6be78079b6dd1638790659d9ed88f0f1177df939299229aa7e6a699c77e60c8b x86_64 python-urllib3-1.10.2-7.el7_9.1.noarch.rpm SHA-256: 19fbcac2a0af072ef3a8ad66059f19830e8f6b154809bb7259039e422ab493d1 Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 SRPM python-urllib3-1.10.2-7.el7_9.1.src.rpm SHA-256: 6be78079b6dd1638790659d9ed88f0f1177df939299229aa7e6a699c77e60c8b s390x python-urllib3-1.10.2-7.el7_9.1.noarch.rpm SHA-256: 19fbcac2a0af072ef3a8ad66059f19830e8f6b154809bb7259039e422ab493d1 Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 SRPM python-urllib3-1.10.2-7.el7_9.1.src.rpm SHA-256: 6be78079b6dd1638790659d9ed88f0f1177df939299229aa7e6a699c77e60c8b ppc64 python-urllib3-1.10.2-7.el7_9.1.noarch.rpm SHA-256: 19fbcac2a0af072ef3a8ad66059f19830e8f6b154809bb7259039e422ab493d1 Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 SRPM python-urllib3-1.10.2-7.el7_9.1.src.rpm SHA-256: 6be78079b6dd1638790659d9ed88f0f1177df939299229aa7e6a699c77e60c8b ppc64le python-urllib3-1.10.2-7.el7_9.1.noarch.rpm SHA-256: 19fbcac2a0af072ef3a8ad66059f19830e8f6b154809bb7259039e422ab493d1 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .