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RLSA-2026:50827

Security Mirrored from RHSA-2026:50827
Issued at: 2026-08-27
Updated at: 2026-08-27

Advisory content derived from Red Hat RHSA-2026:50827, © Red Hat, Inc., used under CC BY 4.0, with modifications.

Synopsis

Important: ruby:4.0 security, bug fix, and enhancement update



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):

* zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)

* net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)

* ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)

* net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)

* net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)

* net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)

Bug Fix(es) and Enhancement(s):

* ruby:4.0/ruby: Rebase to the latest Ruby 4.0 release [rhel-9.8.z] (JIRA:Rocky Linux-211301)

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.



Affected products

Rocky Linux 9 aarch64 Rocky Linux 9 ppc64le Rocky Linux 9 s390x Rocky Linux 9 x86_64

Fixes

2459002 2468494 2468500 2491519 2491522 2491523

CVEs

CVE-2026-27820 CVE-2026-42256 CVE-2026-42257 CVE-2026-47240 CVE-2026-47241 CVE-2026-47242

Affected packages

Rocky Linux 9 aarch64 - AppStream

ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.src.rpm ruby-bundled-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-bundled-gems-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-debugsource-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-default-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-devel-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-doc-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-bigdecimal-0:4.0.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-bigdecimal-debuginfo-0:4.0.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-bundler-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-io-console-0:0.8.2-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-io-console-debuginfo-0:0.8.2-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-irb-0:1.16.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-json-0:2.18.0-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-json-debuginfo-0:2.18.0-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-minitest-0:6.0.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-mysql2-debuginfo-0:0.5.7-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-mysql2-debugsource-0:0.5.7-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-mysql2-doc-0:0.5.7-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-pg-debuginfo-0:1.6.3-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-pg-debugsource-0:1.6.3-1.module+el9.8.0+40094+ce01217c.aarch64.rpm rubygem-pg-doc-0:1.6.3-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-power_assert-0:3.0.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-psych-0:5.3.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-psych-debuginfo-0:5.3.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-racc-0:1.8.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-racc-debuginfo-0:1.8.1-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-rake-0:13.3.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rbs-0:3.10.0-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-rbs-debuginfo-0:3.10.0-34.module+el9.8.0+40271+b5850c84.aarch64.rpm rubygem-rdoc-0:7.0.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rexml-0:3.4.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rss-0:0.3.2-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-devel-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-test-unit-0:3.7.5-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-typeprof-0:0.31.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-libs-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm ruby-libs-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.aarch64.rpm

Rocky Linux 9 x86_64 - AppStream

ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.src.rpm ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-bundled-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-bundled-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-bundled-gems-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-bundled-gems-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-debugsource-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-debugsource-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-default-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-devel-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-devel-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-doc-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-bigdecimal-0:4.0.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-bigdecimal-0:4.0.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-bigdecimal-debuginfo-0:4.0.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-bigdecimal-debuginfo-0:4.0.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-bundler-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-io-console-0:0.8.2-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-io-console-0:0.8.2-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-io-console-debuginfo-0:0.8.2-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-io-console-debuginfo-0:0.8.2-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-irb-0:1.16.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-json-0:2.18.0-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-json-0:2.18.0-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-json-debuginfo-0:2.18.0-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-json-debuginfo-0:2.18.0-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-minitest-0:6.0.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-mysql2-debuginfo-0:0.5.7-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-mysql2-debugsource-0:0.5.7-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-mysql2-doc-0:0.5.7-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-pg-debuginfo-0:1.6.3-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-pg-debugsource-0:1.6.3-1.module+el9.8.0+40094+ce01217c.x86_64.rpm rubygem-pg-doc-0:1.6.3-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-power_assert-0:3.0.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-psych-0:5.3.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-psych-0:5.3.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-psych-debuginfo-0:5.3.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-psych-debuginfo-0:5.3.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-racc-0:1.8.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-racc-0:1.8.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-racc-debuginfo-0:1.8.1-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-racc-debuginfo-0:1.8.1-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-rake-0:13.3.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rbs-0:3.10.0-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-rbs-0:3.10.0-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-rbs-debuginfo-0:3.10.0-34.module+el9.8.0+40271+b5850c84.i686.rpm rubygem-rbs-debuginfo-0:3.10.0-34.module+el9.8.0+40271+b5850c84.x86_64.rpm rubygem-rdoc-0:7.0.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rexml-0:3.4.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rss-0:0.3.2-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-devel-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-test-unit-0:3.7.5-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-typeprof-0:0.31.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-libs-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-libs-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm ruby-libs-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.i686.rpm ruby-libs-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.x86_64.rpm

Rocky Linux 9 ppc64le - AppStream

ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.src.rpm ruby-bundled-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-bundled-gems-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-debugsource-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-default-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-devel-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-doc-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-bigdecimal-0:4.0.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-bigdecimal-debuginfo-0:4.0.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-bundler-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-io-console-0:0.8.2-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-io-console-debuginfo-0:0.8.2-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-irb-0:1.16.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-json-0:2.18.0-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-json-debuginfo-0:2.18.0-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-minitest-0:6.0.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-mysql2-debuginfo-0:0.5.7-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-mysql2-debugsource-0:0.5.7-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-mysql2-doc-0:0.5.7-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-pg-debuginfo-0:1.6.3-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-pg-debugsource-0:1.6.3-1.module+el9.8.0+40094+ce01217c.ppc64le.rpm rubygem-pg-doc-0:1.6.3-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-power_assert-0:3.0.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-psych-0:5.3.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-psych-debuginfo-0:5.3.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-racc-0:1.8.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-racc-debuginfo-0:1.8.1-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-rake-0:13.3.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rbs-0:3.10.0-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-rbs-debuginfo-0:3.10.0-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm rubygem-rdoc-0:7.0.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rexml-0:3.4.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rss-0:0.3.2-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-devel-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-test-unit-0:3.7.5-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-typeprof-0:0.31.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-libs-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm ruby-libs-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.ppc64le.rpm

Rocky Linux 9 s390x - AppStream

ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-0:4.0.6-34.module+el9.8.0+40271+b5850c84.src.rpm ruby-bundled-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-bundled-gems-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-debugsource-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-default-gems-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-devel-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-doc-0:4.0.6-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-bigdecimal-0:4.0.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-bigdecimal-debuginfo-0:4.0.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-bundler-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-io-console-0:0.8.2-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-io-console-debuginfo-0:0.8.2-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-irb-0:1.16.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-json-0:2.18.0-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-json-debuginfo-0:2.18.0-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-minitest-0:6.0.0-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-mysql2-0:0.5.7-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-mysql2-debuginfo-0:0.5.7-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-mysql2-debugsource-0:0.5.7-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-mysql2-doc-0:0.5.7-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-pg-0:1.6.3-1.module+el9.8.0+40094+ce01217c.src.rpm rubygem-pg-debuginfo-0:1.6.3-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-pg-debugsource-0:1.6.3-1.module+el9.8.0+40094+ce01217c.s390x.rpm rubygem-pg-doc-0:1.6.3-1.module+el9.8.0+40094+ce01217c.noarch.rpm rubygem-power_assert-0:3.0.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-psych-0:5.3.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-psych-debuginfo-0:5.3.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-racc-0:1.8.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-racc-debuginfo-0:1.8.1-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-rake-0:13.3.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rbs-0:3.10.0-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-rbs-debuginfo-0:3.10.0-34.module+el9.8.0+40271+b5850c84.s390x.rpm rubygem-rdoc-0:7.0.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rexml-0:3.4.4-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-rss-0:0.3.2-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygems-devel-0:4.0.16-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-test-unit-0:3.7.5-34.module+el9.8.0+40271+b5850c84.noarch.rpm rubygem-typeprof-0:0.31.1-34.module+el9.8.0+40271+b5850c84.noarch.rpm ruby-libs-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm ruby-libs-debuginfo-0:4.0.6-34.module+el9.8.0+40271+b5850c84.s390x.rpm