This Red Hat security advisory addresses two Important-severity vulnerabilities in python-urllib3 for RHEL 10: CVE-2026-44432, a denial-of-service flaw via excessive HTTP response decompression, and CVE-2026-44431, an information disclosure issue where sensitive headers are forwarded during cross-origin redirects. The article does not provide specific CVSS scores, vulnerable version ranges, or the fixed package version number. Administrators should apply the referenced Red Hat update to all affected RHEL 10 systems.
Red Hat Product Errata RHSA-2026:28000 - Security Advisory Issued: 2026-06-22 Updated: 2026-06-22 RHSA-2026:28000 - 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 10. 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 10 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 x86_64 Red Hat Enterprise Linux for IBM z Systems 10 s390x Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x Red Hat Enterprise Linux for Power, little endian 10 ppc64le Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le Red Hat Enterprise Linux for ARM 64 10 aarch64 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 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-184817 - CVE-2026-44431: python-urllib3: Sensitive headers forwarded across origins in proxied low-level redirects [rhel-10.2.z] RHEL-185121 - CVE-2026-44432 - python-urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API [rhel-10.2.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. Click a package name for more details. Red Hat Enterprise Linux for x86_64 10 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 x86_64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 x86_64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for IBM z Systems 10 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 s390x python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 s390x python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for Power, little endian 10 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 ppc64le python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 ppc64le python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for ARM 64 10 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 aarch64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 aarch64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 aarch64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 s390x python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 ppc64le python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 x86_64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 x86_64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 aarch64 python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 ppc64le python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 SRPM python-urllib3-1.26.19-4.el10_2.src.rpm SHA-256: 6a71fa0a21b44184dd5c32aa1c2ea39091056597592900d6b523c7f4a485a994 s390x python3-urllib3-1.26.19-4.el10_2.noarch.rpm SHA-256: 18f4fbe4dbf43227af844d5945c27e1ab275438dee9b5ad37193682bd9452111 The Red Hat security contact is secalert@redhat.com . 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