Claude AI analyzed Vim and GNU Emacs source and generated proof-of-concept exploits that trigger code execution simply by opening a crafted file. A Calif researcher used Claude prompts to find missing modeline security checks in Vim; maintainers released a patch in Vim 9.2.0272. The Emacs issue remains unpatched because the Emacs developer points at Git for remediation. This demonstrates that AI assistants can both find vulnerabilities in source and iteratively produce working PoCs, lowering the bar for exploit development against widely installed editors.
Part of the PlainSec briefing for 2026-04-01