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ALSA-2026:72286 — Important: ruby security, bug fix, and enhancement update

Affected: AlmaLinux:9: ruby, AlmaLinux:9: ruby-default-gems, AlmaLinux:9: ruby-devel, AlmaLinux:9: ruby-doc, AlmaLinux:9: ruby-libs, AlmaLinux:9: rubygem-bigdecimal, AlmaLinux:9: rubygem-bundler, AlmaLinux:9: rubygem-io-console, AlmaLinux:9: rubygem-irb, AlmaLinux:9: rubygem-json and 12 more

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):

* resolv: resolv gem: Denial of Service via uncontrolled memory growth from crafted DNS responses (CVE-2026-80212)

Bug Fix(es) and Enhancement(s):

* ruby %check fails in Konflux: Rinda multicast tests need network device [almalinux-9.8.z] (JIRA:AlmaLinux-255606)

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.

fkie_cve-2026-80212

An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::Resource.get_class, Resolv::DNS::Resource::Generic.create, and Resolv::DNS::SvcParam::Generic.create generate a new class for each unknown DNS resource record (type, class) pair, or each unknown SvcParamKey, encountered while decoding a response. Each generated class was permanently registered both as a constant on Resource (or SvcParam::Generic) and as an entry in a class-lookup hash (ClassHash), and thus the class remained reachable through that constant after the response was discarded. Type and class are each 16-bit values, and thus an attacker controlling DNS responses (a spoofed response, or a malicious or hijacked upstream DNS server) has roughly 2^32 distinct (type, class) pairs to choose from. A single response of a few hundred kilobytes carrying tens of thousands of distinct unknown types permanently grows process memory by tens of megabytes; repeated responses accumulate without bound and are never reclaimed by garbage collection, because the constant keeps each class alive. Any code path that calls Resolv::DNS::Message.decode on attacker-influenced DNS responses is affected. resolv is a default gem, and thus this is reachable from a plain Ruby installation without any additional dependency.

GHSA-x2vh-ff4w-v64c

OESA-2026-3665 — ruby security update

Affected: openEuler:24.03-LTS-SP3: ruby

Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl). Security Fix(es):

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.(CVE-2026-47240)

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to b…

RHSA-2026:57565 — Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

ruby/json: Ruby JSON: Denial of Service or Information Disclosure via format string injection openssl: openssl-src: OpenSSL: Memory leak leads to Denial of Service in OCSP response checking resolv: resolv gem: Denial of Service via uncontrolled memory growth from crafted DNS responses resolv: Resolv gem: DNS allowlist and egress bypass, and cache poisoning via crafted hostnames

RLSA-2026:72285 — Important: ruby:3.3 security update

Affected: Rocky Linux:8: rubygem-abrt, Rocky Linux:8: rubygem-mysql2, Rocky Linux:8: rubygem-pg, Rocky Linux:8: ruby

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):

* resolv: resolv gem: Denial of Service via uncontrolled memory growth from crafted DNS responses (CVE-2026-80212)

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.