CVE-2018-11743

Name: CVE-2018-11743
Creator: NVD / NIST
Published: 2018-06-05T13:29:00.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.20%

Last modified Jun 17, 2026

CVE-2018-11743 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attackers to cause a denial of service (mrb_hash_keys uninitialized pointer and application crash) or possibly have unspecified other impact.. EPSS estimates a 2.20% chance of exploitation in the next 30 days.

Description

The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attackers to cause a denial of service (mrb_hash_keys uninitialized pointer and application crash) or possibly have unspecified other impact.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.20%

80.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-824

Affected Software

Vendor	Product	Versions
Mruby	Mruby	1.4.1
Debian	Debian Linux	9.0

References

https://github.com/mruby/mruby/commit/b64ce17852b180dfeea81cf458660be41a78974dPatch, Third Party Advisory
https://github.com/mruby/mruby/issues/4027Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory
https://github.com/mruby/mruby/commit/b64ce17852b180dfeea81cf458660be41a78974dPatch, Third Party Advisory
https://github.com/mruby/mruby/issues/4027Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory

Timeline

Published: Jun 5, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-11743?

How severe is CVE-2018-11743?

CVE-2018-11743 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.20% probability of exploitation in the next 30 days.

How do I fix CVE-2018-11743?

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-2018-11743?

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

Scan your code now

Source: NVD / NIST