What’s Vulnerable › Vulnerabilities

CVE-2016-2339

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-01-06 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• Ruby: 2.2.2, 2.3.0

References

• http://www.securityfocus.com/bid/91234
• http://www.talosintelligence.com/reports/TALOS-2016-0034/
• 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/
• https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html

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