CVE-2016-2337: Type confusion exists in _cancel_eval Ruby's TclTkIp class method.

Security readout for executives and security teams

Ruby installations using Tcl/Tk bindings may be exposed to a type confusion flaw that can lead to arbitrary code execution. The business risk depends on whether affected Ruby/Tcl/Tk code is present and reachable by untrusted input. Exposure is most likely in systems running affected Ruby versions with Tcl/Tk 8.6 or later and Ruby Tk/Tcl integration enabled. General Ruby services without Tcl/Tk usage may not be affected, but this requires inventory confirmation. Treat as a targeted remediation item for legacy Ruby/Tcl/Tk environments, not a broad internet emergency based on the supplied evidence. Prioritize systems where Tcl/Tk is installed and reachable through untrusted workflows. Mitigation focus: Apply relevant Ruby security updates from the operating system or Ruby vendor.; Review Debian and Gentoo advisories if those distributions are in use.; Upgrade away from affected Ruby builds where vendor updates are available..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.