# alembic — CWE-407 Scan: CLEAN

Scanned: 2026-03-29

## Scope

- `alembic/script/revision.py` — migration DAG traversal
  - `targets = set(targets)` (line 676)
  - `todo = {d.revision for d in revisions}` (line 946, set comprehension)
  - `current_heads` — tuple/set backed
- `alembic/runtime/migration.py` — `heads` is tuple from revision graph

## Verdict

No CWE-407 (algorithmic complexity / quadratic membership check) defects found.
Migration dependency graph traversal and conflict detection use `set`
comprehensions throughout. No list-based membership checks in the revision
walk.