{"id":"UBUNTU-CVE-2026-79590","details":"A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a specially crafted Ruby source file that triggers the parser to pass a NULL pointer to nonnull string handling functions, resulting in undefined behavior and application crash.","modified":"2026-09-16T14:02:25.950996835Z","published":"2026-09-10T22:17:00Z","upstream":["CVE-2026-79590"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-79590"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-79590"},{"type":"REPORT","url":"https://github.com/mruby/mruby/issues/7032"},{"type":"REPORT","url":"https://github.com/takumin/mruby/commit/c6866eed4ad5640b552ba79d16063e7ec70a0ac9"}],"affected":[{"package":{"name":"mruby","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0+20150817+gita1731254-1","1.1.0+20150906+git1cbbb7e1-1","1.2.0+20160315+git4f20d58a-1"],"ecosystem_specific":{"binaries":[{"binary_name":"mruby","binary_version":"1.2.0+20160315+git4f20d58a-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-1","1.3.0+20170925+git38185028-1","1.3.0+20171029+git77edafb0-1","1.4.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.0-1","binary_name":"mruby"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"mruby","binary_version":"2.0.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-3","3.0.0-1","3.0.0-3"],"ecosystem_specific":{"binaries":[{"binary_name":"mruby","binary_version":"3.0.0-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.0-1","3.2.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"mruby","binary_version":"3.2.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/mruby?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0-1","3.4.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"mruby","binary_version":"3.4.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79590.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}