I reproduced a Claude Code RCE. The bug pattern is everywhere.

A security researcher reproduced a remote code execution (RCE) vulnerability in Claude Code 2.1.118, which was disclosed by researcher Joernchen. The bug has since been fixed, but the underlying parsing anti-pattern that enabled it remains common across many AI developer tools. The researcher documented the reproduction process and analysis in a detailed article.

Last week, security researcher Joernchen published a clever RCE in Claude Code 2.1.118. I spent Saturday reproducing it from the advisory to understand the pattern. The bug is fixed now, but the parsing anti-pattern behind it is everywhere in AI developer tools. I've written a full article here: https://vechron.com/2026/05/i-reproduced-a-claude-code-rce-the-bug-pattern-is-everywhere/