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Vulnerability record · CVE-2016-2339 · published 6 January 2017

CVE-2016-2339: Ruby-lang ruby memory buffer overflow vulnerability

Ruby Lang · Ruby

An exploitable heap overflow vulnerability exists in the Fiddle::Function.new "initialize" function functionality of Ruby. In Fiddle::Function.new "initialize" heap buffer "arg_types" allocation is made based on args array length. Specially constructed object passed as element of args array can increase this array size after mentioned allocation and cause heap overflow.

9.8 CVSS 3.0 Critical EPSS 5.2% · top 7.8% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An exploitable heap overflow vulnerability exists in the Fiddle::Function.new "initialize" function functionality of Ruby. In Fiddle::Function.new "initialize" heap buffer "arg_types" allocation is made based on args array length. Specially constructed object passed as element of args array can increase this array size after mentioned allocation and cause heap overflow.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/91234
http://www.talosintelligence.com/reports/TALOS-2016-0034/ ExploitTechnical DescriptionThird Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
http://www.securityfocus.com/bid/91234
http://www.talosintelligence.com/reports/TALOS-2016-0034/ ExploitTechnical DescriptionThird Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-2339), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.