{"schema_version": "1.7.0", "id": "RLSA-2026:50773", "modified": "2026-08-27T00:11:38.110277Z", "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"], "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.", "severity": [{"type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"}], "affected": [{"package": {"ecosystem": "Rocky Linux:10", "name": "ruby4.0", "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"}}]}], "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"}], "credits": [{"name": "Rocky Enterprise Software Foundation"}, {"name": "Red Hat"}], "database_specific": {"license": "CC-BY-4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/", "source_advisory": "RHSA-2026:50773"}}