CVE-2018-12249

Name: CVE-2018-12249
Creator: NVD / NIST
Published: 2018-06-12T14:29:00.46+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.12%

Last modified Jun 17, 2026

CVE-2018-12249 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class_real because "class BasicObject" is not properly supported in class.c.. EPSS estimates a 2.12% chance of exploitation in the next 30 days.

Description

An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class_real because "class BasicObject" is not properly supported in class.c.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.12%

79.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Mruby	Mruby	1.4.1
Debian	Debian Linux	9.0

References

https://github.com/mruby/mruby/commit/faa4eaf6803bd11669bc324b4c34e7162286bfa3Patch, Third Party Advisory
https://github.com/mruby/mruby/issues/4037Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory
https://github.com/mruby/mruby/commit/faa4eaf6803bd11669bc324b4c34e7162286bfa3Patch, Third Party Advisory
https://github.com/mruby/mruby/issues/4037Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory

Timeline

Published: Jun 12, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12249?

An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class_real because "class BasicObject" is not properly supported in class.c.

How severe is CVE-2018-12249?

CVE-2018-12249 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.12% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12249?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12249?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST