{"id":"CVE-2026-79590","title":"A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0","summary":"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 functio…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"published":"2026-09-10","updated":"2026-09-22","sourceUpdated":"2026-09-22T20:00:03.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-79590","references":[{"url":"https://github.com/mruby/mruby/issues/7032","label":"cve@mitre.org"},{"url":"https://github.com/takumin/mruby/commit/c6866eed4ad5640b552ba79d16063e7ec70a0ac9","label":"cve@mitre.org"},{"url":"https://github.com/mruby/mruby/issues/7032","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00254,"epssPercentile":0.17244,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T17:16:11.550926Z"},"ingestedAt":"2026-09-11T16:45:48.021Z","slug":"CVE-2026-79590","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203132,"id":"CVE-2026-79590","ts":1789409580291,"field":"exploit_available","old":"false","new":"true"},{"seq":203131,"id":"CVE-2026-79590","ts":1789409580291,"field":"cvss","old":null,"new":"6.5"},{"seq":203130,"id":"CVE-2026-79590","ts":1789409580291,"field":"severity","old":"none","new":"medium"}]}