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diamond-scan: cpython/django O(2^D) hierarchy traversal; flask/rails/ruby/phoenix CLEAN

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cpython-0001: pydoc.allmethods unconditional __bases__ recursion, no visited guard
cpython-0002: turtle.__methodDict unconditional __bases__ recursion, fires at import
cpython-0003: idlelib.rpc._getmethods unconditional __bases__ recursion, IDLE debug path
django-0006: migrations.state.flatten_bases abstract model diamond traversal (comment in source acknowledges duplicates)
flask/rails/ruby/phoenix: CLEAN
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russell@unturf.com 2026-03-29 20:16:12 -04:00
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# Phoenix — CWE-407 Diamond Traversal Scan: CLEAN
Scanned: 2026-03-30
## Files examined
- `lib/phoenix/router.ex` — plug pipeline compilation uses Elixir macros; no recursive module hierarchy traversal
- `lib/phoenix/endpoint.ex` — module configuration, no class hierarchy traversal
- `lib/phoenix/channel.ex` — no recursive module traversal
## Result
No diamond recursion defects found. Elixir's module system is flat — modules do not have a
mutable inheritance hierarchy that can form diamonds. `use Phoenix.Router` and related macros
expand at compile time into a flat list of plugs. No recursive `ancestors`/`__bases__` pattern
exists in Elixir/Phoenix.