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No exploitation reportedFix available

CVE-2018-12249

No exploitation reported by the sources we read.

  • Published2018-06-12
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-06-1214:29CVE publishedNVD

Versions per branch

NVD
Mruby
BranchAffectedFixed in
1.4= 1.4.1no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mrubyUbuntu:26.10all versions · no fixed version listed
  • mrubyUbuntu:26.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:25.10all versions · no fixed version listed
  • mrubyUbuntu:24.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:22.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:20.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:18.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:16.04:LTSall versions · no fixed version listed

4 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2018-06-12
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3h2j-h4g8-5pmr

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.

Is CVE-2018-12249 actively exploited?

Active exploitation of CVE-2018-12249 has not been confirmed. Its EPSS score was 2.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-12249?

CVE-2018-12249 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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