This security update addresses two vulnerabilities in the python3.12-urllib3 library for RHEL 9: CVE-2026-44432, a denial-of-service flaw via excessive HTTP response decompression, and CVE-2026-44431, an information disclosure issue where cross-origin redirects could forward sensitive headers. The advisory is rated Important, but specific CVSS scores and affected version ranges are not provided in the article. Red Hat has released patched packages, and administrators should apply the update following the referenced solution article.
Red Hat Product Errata RHSA-2026:28159 - Security Advisory Issued: 2026-06-23 Updated: 2026-06-23 RHSA-2026:28159 - Security Advisory Overview Updated Packages Synopsis Important: python3.12-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 python3.12-urllib3 is now available for Red Hat Enterprise Linux 9. 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: Denial of Service due to excessive HTTP response decompression (CVE-2026-44432) urllib3: urllib3: Information disclosure via cross-origin redirects forwarding sensitive headers (CVE-2026-44431) 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 9 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 x86_64 Red Hat Enterprise Linux for IBM z Systems 9 s390x Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 s390x Red Hat Enterprise Linux for Power, little endian 9 ppc64le Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 ppc64le Red Hat Enterprise Linux for ARM 64 9 aarch64 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 s390x Fixes BZ - 2477154 - CVE-2026-44432 urllib3: urllib3: Denial of Service due to excessive HTTP response decompression BZ - 2477167 - CVE-2026-44431 urllib3: urllib3: Information disclosure via cross-origin redirects forwarding sensitive headers RHEL-184901 - CVE-2026-44431: python3.12-urllib3: Sensitive headers forwarded across origins in proxied low-level redirects [rhel-9.8.z] RHEL-185126 - CVE-2026-44432 - python3.12-urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API [rhel-9.8.z] CVEs CVE-2026-44431 CVE-2026-44432 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. 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Red Hat Enterprise Linux for x86_64 9 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb x86_64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb x86_64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for IBM z Systems 9 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb s390x python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb s390x python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for Power, little endian 9 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb ppc64le python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb ppc64le python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for ARM 64 9 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb aarch64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb aarch64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb ppc64le python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb x86_64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb aarch64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb s390x python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb x86_64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb aarch64 python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb ppc64le python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 SRPM python3.12-urllib3-1.26.19-3.el9_8.src.rpm SHA-256: 0c286d765dce7985734dfee21343b7e59c425b6bf2dee4bd9f54d8f8c3b381eb s390x python3.12-urllib3-1.26.19-3.el9_8.noarch.rpm SHA-256: b2cf6fcb06b1d59df2b181d19a3ac6b07183c9eaa1a90a459df1cf0b5fb637fb The Red Hat security contact is secalert@redhat.com . 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