CVE-2026-79590
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductMruby
PublishedSep 10, 2026
First seenSep 10, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mruby | 4.0.0 | — |
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