{"id":"DEBIAN-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":"2026-09-23T08:47:30.074957007Z","published":"2026-09-10T22:17:00.267Z","upstream":["CVE-2026-79590"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-79590"}],"affected":[{"package":{"name":"mruby","ecosystem":"Debian:12","purl":"pkg:deb/debian/mruby?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.0-3","3.2.0-1","3.2.0-2","3.3.0-1","3.3.0~rc2-1","3.4.0-1","3.4.0-1~exp1","3.4.0-1~exp2","3.4.0-2","3.4.0-3","4.0.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Debian:13","purl":"pkg:deb/debian/mruby?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0-1","3.4.0-1","3.4.0-1~exp1","3.4.0-1~exp2","3.4.0-2","3.4.0-3","4.0.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-79590.json"}},{"package":{"name":"mruby","ecosystem":"Debian:14","purl":"pkg:deb/debian/mruby?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0-1","3.4.0-1","3.4.0-1~exp1","3.4.0-1~exp2","3.4.0-2","3.4.0-3","4.0.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-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"}]}