CVE-2026-79590

Name	CVE-2026-79590
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mruby (PTS)	bookworm	3.1.0-3	vulnerable
	trixie	3.3.0-1	vulnerable
	forky, sid	4.0.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mruby	source	(unstable)	(unfixed)

https://github.com/mruby/mruby/issues/7032
Fixed by: https://github.com/mruby/mruby/commit/c6866eed4ad5640b552ba79d16063e7ec70a0ac9 (4.1.0-rc)