{"id":"UBUNTU-CVE-2026-42258","details":"Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.","modified":"2026-07-16T20:39:47.000678392Z","published":"2026-05-09T20:16:00Z","related":["USN-8556-1"],"upstream":["CVE-2026-42258"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42258"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-42258"},{"type":"REPORT","url":"https://github.com/ruby/net-imap/releases/tag/v0.4.24"},{"type":"REPORT","url":"https://github.com/ruby/net-imap/releases/tag/v0.5.14"},{"type":"REPORT","url":"https://github.com/ruby/net-imap/releases/tag/v0.6.4"},{"type":"REPORT","url":"https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8556-1"}],"affected":[{"package":{"name":"jruby","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.6-5ubuntu1","1.5.6-6","1.5.6-7","1.5.6-9+deb8u2build0.14.04.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"1.5.6-9+deb8u2build0.14.04.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"ruby2.3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.1-2~ubuntu16.04.16+esm15"}]}],"versions":["2.3.0-1","2.3.0-2","2.3.0-4ubuntu2","2.3.0-4ubuntu3","2.3.0-5ubuntu1","2.3.1-2~16.04","2.3.1-2~16.04.2","2.3.1-2~16.04.4","2.3.1-2~16.04.5","2.3.1-2~16.04.6","2.3.1-2~16.04.7","2.3.1-2~16.04.9","2.3.1-2~16.04.10","2.3.1-2~16.04.11","2.3.1-2~16.04.12","2.3.1-2~ubuntu16.04.13","2.3.1-2~ubuntu16.04.14","2.3.1-2~ubuntu16.04.15","2.3.1-2~ubuntu16.04.16","2.3.1-2~ubuntu16.04.16+esm1","2.3.1-2~ubuntu16.04.16+esm2","2.3.1-2~ubuntu16.04.16+esm3","2.3.1-2~ubuntu16.04.16+esm4","2.3.1-2~ubuntu16.04.16+esm5","2.3.1-2~ubuntu16.04.16+esm6","2.3.1-2~ubuntu16.04.16+esm7","2.3.1-2~ubuntu16.04.16+esm8","2.3.1-2~ubuntu16.04.16+esm9","2.3.1-2~ubuntu16.04.16+esm10","2.3.1-2~ubuntu16.04.16+esm11","2.3.1-2~ubuntu16.04.16+esm12","2.3.1-2~ubuntu16.04.16+esm14"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.1-2~ubuntu16.04.16+esm15","binary_name":"libruby2.3"},{"binary_name":"ruby2.3","binary_version":"2.3.1-2~ubuntu16.04.16+esm15"},{"binary_version":"2.3.1-2~ubuntu16.04.16+esm15","binary_name":"ruby2.3-tcltk"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"jruby","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.21-2ubuntu4","1.7.22-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"1.7.22-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"ruby2.5","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ruby2.5?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0~preview1-1ubuntu2","2.5.0-4ubuntu1","2.5.0-4ubuntu4","2.5.0-5ubuntu1","2.5.0-6ubuntu1","2.5.1-1ubuntu1","2.5.1-1ubuntu1.1","2.5.1-1ubuntu1.2","2.5.1-1ubuntu1.4","2.5.1-1ubuntu1.5","2.5.1-1ubuntu1.6","2.5.1-1ubuntu1.7","2.5.1-1ubuntu1.8","2.5.1-1ubuntu1.9","2.5.1-1ubuntu1.10","2.5.1-1ubuntu1.11","2.5.1-1ubuntu1.12","2.5.1-1ubuntu1.13","2.5.1-1ubuntu1.14","2.5.1-1ubuntu1.15","2.5.1-1ubuntu1.16","2.5.1-1ubuntu1.16+esm1","2.5.1-1ubuntu1.16+esm3","2.5.1-1ubuntu1.16+esm4","2.5.1-1ubuntu1.16+esm5","2.5.1-1ubuntu1.16+esm6","2.5.1-1ubuntu1.16+esm7","2.5.1-1ubuntu1.16+esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"libruby2.5","binary_version":"2.5.1-1ubuntu1.16+esm8"},{"binary_version":"2.5.1-1ubuntu1.16+esm8","binary_name":"ruby2.5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"jruby","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1.13.0-1","9.1.17.0-1~18.04"],"ecosystem_specific":{"binaries":[{"binary_version":"9.1.17.0-1~18.04","binary_name":"jruby"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"ruby2.7","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby2.7?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0-1","2.7.0-2","2.7.0-3","2.7.0-4","2.7.0-4ubuntu1","2.7.0-5ubuntu1","2.7.0-5ubuntu1.1","2.7.0-5ubuntu1.2","2.7.0-5ubuntu1.3","2.7.0-5ubuntu1.4","2.7.0-5ubuntu1.5","2.7.0-5ubuntu1.6","2.7.0-5ubuntu1.7","2.7.0-5ubuntu1.8","2.7.0-5ubuntu1.9","2.7.0-5ubuntu1.10","2.7.0-5ubuntu1.11","2.7.0-5ubuntu1.12","2.7.0-5ubuntu1.13","2.7.0-5ubuntu1.14","2.7.0-5ubuntu1.15","2.7.0-5ubuntu1.16","2.7.0-5ubuntu1.17","2.7.0-5ubuntu1.18","2.7.0-5ubuntu1.18+esm1","2.7.0-5ubuntu1.18+esm3","2.7.0-5ubuntu1.18+esm4","2.7.0-5ubuntu1.18+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"2.7.0-5ubuntu1.18+esm5","binary_name":"libruby2.7"},{"binary_version":"2.7.0-5ubuntu1.18+esm5","binary_name":"ruby2.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"jruby","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1.17.0-3","9.1.17.0-3build5","9.1.17.0-3build6"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"9.1.17.0-3build6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"ruby3.0","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ruby3.0?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.2-5ubuntu1","3.0.2-7","3.0.2-7ubuntu2","3.0.2-7ubuntu2.1","3.0.2-7ubuntu2.2","3.0.2-7ubuntu2.3","3.0.2-7ubuntu2.4","3.0.2-7ubuntu2.5","3.0.2-7ubuntu2.6","3.0.2-7ubuntu2.7","3.0.2-7ubuntu2.8","3.0.2-7ubuntu2.10","3.0.2-7ubuntu2.11","3.0.2-7ubuntu2.12","3.0.2-7ubuntu2.13"],"ecosystem_specific":{"binaries":[{"binary_name":"libruby3.0","binary_version":"3.0.2-7ubuntu2.13"},{"binary_name":"ruby3.0","binary_version":"3.0.2-7ubuntu2.13"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"jruby","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.3.9.0+ds-1","9.4.5.0+ds-1","9.4.5.0+ds-1ubuntu1","9.4.6.0+ds-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"9.4.6.0+ds-1ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42258.json"}},{"package":{"name":"ruby3.2","ecosys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