Red Hat Product Errata RHSA-2026:33577 - Security Advisory Issued: 2026-06-30 Updated: 2026-06-30 RHSA-2026:33577 - Security Advisory Overview Updated Packages Synopsis Important: ruby:4.0 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 the ruby:4.0 module 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 Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks. Security Fix(es): ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses (CVE-2026-42245) ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments (CVE-2026-42258) net-imap: ruby: Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS (CVE-2026-42246) 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 - 2468495 - CVE-2026-42245 ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses BZ - 2468498 - CVE-2026-42258 ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments BZ - 2468499 - CVE-2026-42246 net-imap: ruby: Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS CVEs CVE-2026-42245 CVE-2026-42246 CVE-2026-42258 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 9 SRPM ruby-4.0.3-33.module+el9.8.0+24428+77f1d00a.src.rpm SHA-256: ab6127f877490fbe9679e729c188ed2a93fcf4cb0dfe7e77dd83858d5bf42db4 rubygem-mysql2-0.5.7-1.module+el9.8.0+24428+77f1d00a.src.rpm SHA-256: 9f864e48d7549ae66d743630b159d453e822f784b58d65546e0957f14ca6fd51 rubygem-pg-1.6.3-1.module+el9.8.0+24428+77f1d00a.src.rpm SHA-256: d331abe951b6e082af386a84aa31b69f86ddf33fc49964db07279093268052e0 x86_64 ruby-default-gems-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 3a295c92d269d9f3fc558b9548f276e4500c77812f0ef0e1c982e287791a7d9c ruby-doc-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 4c36a728e1d199902ff548517696eac085ce8ba4923ed089a92b0b1e952e7501 rubygem-bundler-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 6884cb28e7430267da41e96380b734d4c71638236f907b82cf6dcd7bf1cd685c rubygem-irb-1.16.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 296a28a327e7f9dce7efeb86a8f4604d3e88a94fbfb955e0b158a258122fb924 rubygem-minitest-6.0.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 220d21e25372ccbcaf6f036cce1efd2e712180df9840676762ee24b7e8840a41 rubygem-mysql2-doc-0.5.7-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 9c1251e0c2772abb433b5c911002f0ac82d14b117ad4f9ed764939d34ba6b81a rubygem-pg-doc-1.6.3-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bfb182ec8ffccf8fe407c85731fa5e6f1a0edc39fcbd4ab217e040acb9e38d81 rubygem-power_assert-3.0.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bd888ec088f106d9d9a3a19fe4a64a2e864cb3e8924d5f9d4bce5e29d050def7 rubygem-rake-13.3.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 81c863a6b2976a1171ae8a74a06a6bf4bfabdf335560c3854de8fb4f83f8e08d rubygem-rdoc-7.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: ec521444e99e2a0904cd2caa5edb794f48b7baaa8ec7f0f414880753f6a70df1 rubygem-rexml-3.4.4-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: dfd536be50371397589a3524e19859de985d5f7960e9705524dccbbbef4f905a rubygem-rss-0.3.2-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 80098207746701ade5efafae88e63a86b452d3923e3e3d6c971815d6eda5ce8e rubygem-test-unit-3.7.5-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: e6f28c9be751128124558b3cd18b78ec7107bb66254fdaa97fafa04a9b96cf80 rubygem-typeprof-0.31.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 3600b93fbf3172aef4a2fe8d6c08bf19058b07285e5408ab6a2c7ddabe4e5ea8 rubygems-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: d1dc98f33c43e9464437066d6d2f09b88155c38f07849b353f325a5f3dc02ca3 rubygems-devel-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: b807646aa0ecc30c4e1ce53298d4c81d8519add2faf222a8b4c581b8bc8830f7 ruby-default-gems-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 3a295c92d269d9f3fc558b9548f276e4500c77812f0ef0e1c982e287791a7d9c ruby-doc-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 4c36a728e1d199902ff548517696eac085ce8ba4923ed089a92b0b1e952e7501 rubygem-bundler-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 6884cb28e7430267da41e96380b734d4c71638236f907b82cf6dcd7bf1cd685c rubygem-irb-1.16.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 296a28a327e7f9dce7efeb86a8f4604d3e88a94fbfb955e0b158a258122fb924 rubygem-minitest-6.0.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 220d21e25372ccbcaf6f036cce1efd2e712180df9840676762ee24b7e8840a41 rubygem-mysql2-doc-0.5.7-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 9c1251e0c2772abb433b5c911002f0ac82d14b117ad4f9ed764939d34ba6b81a rubygem-pg-doc-1.6.3-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bfb182ec8ffccf8fe407c85731fa5e6f1a0edc39fcbd4ab217e040acb9e38d81 rubygem-power_assert-3.0.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bd888ec088f106d9d9a3a19fe4a64a2e864cb3e8924d5f9d4bce5e29d050def7 rubygem-rake-13.3.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 81c863a6b2976a1171ae8a74a06a6bf4bfabdf335560c3854de8fb4f83f8e08d rubygem-rdoc-7.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: ec521444e99e2a0904cd2caa5edb794f48b7baaa8ec7f0f414880753f6a70df1 rubygem-rexml-3.4.4-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: dfd536be50371397589a3524e19859de985d5f7960e9705524dccbbbef4f905a rubygem-rss-0.3.2-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 80098207746701ade5efafae88e63a86b452d3923e3e3d6c971815d6eda5ce8e rubygem-test-unit-3.7.5-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: e6f28c9be751128124558b3cd18b78ec7107bb66254fdaa97fafa04a9b96cf80 rubygem-typeprof-0.31.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 3600b93fbf3172aef4a2fe8d6c08bf19058b07285e5408ab6a2c7ddabe4e5ea8 rubygems-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: d1dc98f33c43e9464437066d6d2f09b88155c38f07849b353f325a5f3dc02ca3 rubygems-devel-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: b807646aa0ecc30c4e1ce53298d4c81d8519add2faf222a8b4c581b8bc8830f7 ruby-default-gems-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 3a295c92d269d9f3fc558b9548f276e4500c77812f0ef0e1c982e287791a7d9c ruby-doc-4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 4c36a728e1d199902ff548517696eac085ce8ba4923ed089a92b0b1e952e7501 rubygem-bundler-4.0.6-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 6884cb28e7430267da41e96380b734d4c71638236f907b82cf6dcd7bf1cd685c rubygem-irb-1.16.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 296a28a327e7f9dce7efeb86a8f4604d3e88a94fbfb955e0b158a258122fb924 rubygem-minitest-6.0.0-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 220d21e25372ccbcaf6f036cce1efd2e712180df9840676762ee24b7e8840a41 rubygem-mysql2-doc-0.5.7-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 9c1251e0c2772abb433b5c911002f0ac82d14b117ad4f9ed764939d34ba6b81a rubygem-pg-doc-1.6.3-1.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bfb182ec8ffccf8fe407c85731fa5e6f1a0edc39fcbd4ab217e040acb9e38d81 rubygem-power_assert-3.0.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: bd888ec088f106d9d9a3a19fe4a64a2e864cb3e8924d5f9d4bce5e29d050def7 rubygem-rake-13.3.1-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 81c863a6b2976a1171ae8a74a06a6bf4bfabdf335560c3854de8fb4f83f8e08d rubygem-rdoc-7.0.3-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: ec521444e99e2a0904cd2caa5edb794f48b7baaa8ec7f0f414880753f6a70df1 rubygem-rexml-3.4.4-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: dfd536be50371397589a3524e19859de985d5f7960e9705524dccbbbef4f905a rubygem-rss-0.3.2-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: 80098207746701ade5efafae88e63a86b452d3923e3e3d6c971815d6eda5ce8e rubygem-test-unit-3.7.5-33.module+el9.8.0+24428+77f1d00a.noarch.rpm SHA-256: e6f28c9be751128124558b3cd18b78ec7107bb66254fdaa97fafa04a9b96cf80 rubygem-typeprof-0.31.1-33.module+el9.8.0+24