CVE-2026-79590

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Published 2026-09-10. Last modified 2026-09-22.