{"id":"UBUNTU-CVE-2018-8778","details":"In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker controlling the unpacking format (similar to format string vulnerabilities) can trigger a buffer under-read in the String#unpack method, resulting in a massive and controlled information disclosure.","modified":"2026-02-04T02:57:14.885377Z","published":"2018-04-03T00:00:00Z","related":["USN-3626-1"],"upstream":["CVE-2018-8778"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-8778"},{"type":"REPORT","url":"https://www.ruby-lang.org/en/news/2018/03/28/buffer-under-read-unpack-cve-2018-8778/"},{"type":"REPORT","url":"https://github.com/ruby/ruby/commit/d02b7bd864706fc2a40d83fb6014772ad3cc3b80"},{"type":"REPORT","url":"https://github.com/ruby/ruby/commit/4cd92d7b13002161a3452a0fe278b877901a8859"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3626-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-8778"}],"affected":[{"package":{"name":"ruby1.9.1","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/ruby1.9.1@1.9.3.484-2ubuntu1.11?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.3.484-2ubuntu1.11"}]}],"versions":["1.9.3.194-8.1ubuntu2","1.9.3.448-1ubuntu1","1.9.3.448-1ubuntu2","1.9.3.484-1ubuntu1","1.9.3.484-1ubuntu2","1.9.3.484-2ubuntu1","1.9.3.484-2ubuntu1.1","1.9.3.484-2ubuntu1.2","1.9.3.484-2ubuntu1.3","1.9.3.484-2ubuntu1.5","1.9.3.484-2ubuntu1.6","1.9.3.484-2ubuntu1.7","1.9.3.484-2ubuntu1.8","1.9.3.484-2ubuntu1.10"],"ecosystem_specific":{"binaries":[{"binary_name":"libruby1.9.1","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"libtcltk-ruby1.9.1","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ri1.9.1","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ruby1.9.1","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ruby1.9.1-dev","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ruby1.9.1-examples","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ruby1.9.1-full","binary_version":"1.9.3.484-2ubuntu1.11"},{"binary_name":"ruby1.9.3","binary_version":"1.9.3.484-2ubuntu1.11"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-8778.json"}},{"package":{"name":"ruby2.0","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/ruby2.0@2.0.0.484-1ubuntu2.9?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0.484-1ubuntu2.9"}]}],"versions":["2.0.0.299-2","2.0.0.343-1","2.0.0.343-1ubuntu1","2.0.0.353-1","2.0.0.353-1ubuntu1","2.0.0.484-1ubuntu1","2.0.0.484-1ubuntu2","2.0.0.484-1ubuntu2.1","2.0.0.484-1ubuntu2.2","2.0.0.484-1ubuntu2.4","2.0.0.484-1ubuntu2.5","2.0.0.484-1ubuntu2.6","2.0.0.484-1ubuntu2.8"],"ecosystem_specific":{"binaries":[{"binary_name":"libruby2.0","binary_version":"2.0.0.484-1ubuntu2.9"},{"binary_name":"ruby2.0","binary_version":"2.0.0.484-1ubuntu2.9"},{"binary_name":"ruby2.0-dev","binary_version":"2.0.0.484-1ubuntu2.9"},{"binary_name":"ruby2.0-tcltk","binary_version":"2.0.0.484-1ubuntu2.9"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-8778.json"}},{"package":{"name":"ruby2.3","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ruby2.3@2.3.1-2~16.04.9?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.1-2~16.04.9"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"libruby2.3","binary_version":"2.3.1-2~16.04.9"},{"binary_name":"ruby2.3","binary_version":"2.3.1-2~16.04.9"},{"binary_name":"ruby2.3-dev","binary_version":"2.3.1-2~16.04.9"},{"binary_name":"ruby2.3-tcltk","binary_version":"2.3.1-2~16.04.9"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-8778.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}