{"id":"RLSA-2026:50773","summary":"Important: ruby4.0 security, bug fix, and enhancement update","details":"Ruby is the interpreted scripting language for quick and easy object-oriented programming.  It has many features to process text files and to do system management tasks (as in Perl).  It is simple, straight-forward, and extensible.\n\nSecurity Fix(es):\n\n* zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)\n\n* net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)\n\n* ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)\n\n* net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)\n\n* net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)\n\n* net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)\n\nBug Fix(es) and Enhancement(s):\n\n* ruby4.0: Rebase to the latest Ruby 4.0 release [rhel-10.2.z] (JIRA:Rocky Linux-211310)\n\nFor 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.","modified":"2026-08-27T00:30:03.608169714Z","published":"2026-08-27T00:08:23.329016Z","upstream":["CVE-2026-27820","CVE-2026-42256","CVE-2026-42257","CVE-2026-47240","CVE-2026-47241","CVE-2026-47242"],"database_specific":{"license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","source_advisory":"RHSA-2026:50773"},"references":[{"type":"ADVISORY","url":"https://errata.rockylinux.org/RLSA-2026:50773"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491522"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2468494"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2468500"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2459002"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491523"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491519"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50773"}],"affected":[{"package":{"name":"ruby4.0","ecosystem":"Rocky Linux:10","purl":"pkg:rpm/rocky-linux/ruby4.0?distro=rocky-linux-10&epoch=0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.0.6-36.el10_2"}],"database_specific":{"yum_repository":"AppStream"}}],"database_specific":{"source":"https://storage.googleapis.com/resf-osv-data/RLSA-2026:50773.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"}],"credits":[{"name":"Rocky Enterprise Software Foundation"},{"name":"Red Hat"}]}