Issued at: 2026-08-27
Updated at: 2026-08-28
Advisory content derived from Red Hat RHSA-2026:50773, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: ruby4.0 security, bug fix, and enhancement update
Description
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.
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):
* ruby4.0: Rebase to the latest Ruby 4.0 release [rhel-10.2.z] (JIRA:Rocky Linux-211310)
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.