Open‑Weight LLMs Replicate Anthropic Mythos FreeBSD RCE Discovery for Under $100
Using the same three‑stage nano‑analyzer pipeline that AIS LE used with GPT‑5.4‑nano, the author runs open‑weight models (GPT‑OSS‑20B and Gemma‑4‑31B‑IT) on the full FreeBSD RPCSEC_GSS codebase and, after a simple reachability tweak, successfully flags the 17‑year‑old CVE‑2026‑4747 RCE. The experiment shows that modest, locally run models can duplicate frontier‑model zero‑day detection when supported by effective scaffolding.