# CVE-2026-79590

## Summary

- **CVE ID:** CVE-2026-79590
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](https://github.com/mruby/mruby/issues/7032)
- [CNA](https://github.com/takumin/mruby/commit/c6866eed4ad5640b552ba79d16063e7ec70a0ac9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 17.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._