Red Hat Product Errata RHSA-2026:59248 - Security Advisory Issued: 2026-08-25 Updated: 2026-08-25 RHSA-2026:59248 - Security Advisory Overview Updated Packages Synopsis Important: python-pyasn1 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-pyasn1 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): pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59886) 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 - 2500041 - CVE-2026-59886 pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values CVEs CVE-2026-59886 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 - Extended Life Cycle Long Life 8.4 SRPM python-pyasn1-0.3.7-6.el8_4.2.src.rpm SHA-256: ba4db31be0350c75bc0fa1bfadad64fe9ffbbd1667753f6669c6923d47130459 x86_64 python3-pyasn1-0.3.7-6.el8_4.2.noarch.rpm SHA-256: fbe8731fbb7d1359b18a99caf8daa5fb995962a1b45b3954c5e5d65f197ea477 python3-pyasn1-modules-0.3.7-6.el8_4.2.noarch.rpm SHA-256: d5734e278e23fcd28b42ac66c7ca95ea20d206066040ff1fc8ac54acb4acff21 Red Hat Enterprise Linux Server - AUS 8.4 SRPM python-pyasn1-0.3.7-6.el8_4.2.src.rpm SHA-256: ba4db31be0350c75bc0fa1bfadad64fe9ffbbd1667753f6669c6923d47130459 x86_64 python3-pyasn1-0.3.7-6.el8_4.2.noarch.rpm SHA-256: fbe8731fbb7d1359b18a99caf8daa5fb995962a1b45b3954c5e5d65f197ea477 python3-pyasn1-modules-0.3.7-6.el8_4.2.noarch.rpm SHA-256: d5734e278e23fcd28b42ac66c7ca95ea20d206066040ff1fc8ac54acb4acff21 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .