# CWE-407 Scan — bottle (Python micro web framework)

**Result: CLEAN**
**Date: 2026-03-30**
**Repo:** https://github.com/bottlepy/bottle (depth=1)

## Scan Summary

Scanned `bottle.py` (single-file framework) for O(N²) list membership patterns:
visited/seen list accumulation, `not in list` guards inside loops, and plugin/route dedup.

## Findings

No CWE-407 defects found.

### Key paths examined

| Path | Pattern | Verdict |
|------|---------|---------|
| `Router.match()` | Static routes use `dict` (O(1)), dynamic routes use combined regex | CLEAN |
| `Route.all_plugins()` | Dedup via `unique = set()` + `unique.add(name)` | CLEAN |
| `Bottle._mount_app()` | `self._mounts.append(app)` with no inner loop membership check | CLEAN |
| `SimpleTemplate._include()` | `self.cache[_name]` dict lookup for template inclusion | CLEAN |
| `_NamespacedImporter.load_module()` | `sys.modules` dict check — O(1) | CLEAN |
| `Bottle.remove_hook()` | `func in self._hooks[name]` single scan to remove — not in a loop | CLEAN |

### Why bottle is clean

Bottle's routing layer uses Python `dict` for static routes (O(1) lookup). Dynamic routes
are compiled into combined regexes. Plugin deduplication uses a `set()`. Template inclusion
uses a per-template dict cache. No accumulating visited-list inside an outer loop was found.
