Anthropic's Claude Opus 4.6 has reportedly found over 500 high-severity open-source flaws, with some outlets specifying that these are previously unknown or zero-day vulnerabilities. The discovery was made during testing and affects major open-source libraries, including specific ones such as Ghostscript, OpenSC, and CGIF. The findings have raised questions about who will patch these vulnerabilities and how security leaders should respond to mitigate potential attacks.