tiangolo/fastapi

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101 of your 191 findings came from Repobility's proprietary detections. ✓ Repobility tags below mark them.

Scan timing: clone 20.75s · analysis 7.55s · 33.5 MB · GitHub preflight 1043ms

https://github.com/tiangolo/fastapi.git · scanned 2026-05-19 15:32 UTC (2 weeks, 2 days ago) · 10 languages

675 findings (191 legacy + 484 scanner) 10/12 scanners ran 86th percentile · Python · large (100-500K LoC) Scanner says 70 (higher by 15)

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UNIFIED Repobility · multi-layer engine · AI coders

Complete repo analysis

Last scanned 2 weeks, 2 days ago · v2 · 433 findings from 2 sources. Findings combine the legacy security pipeline AND the multi-layer engine (atlas, wiring, flows, ranked) AND verified AI agent contributions.

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Score breakdown â 2026-05-18-v5

Component	Sub-score	Weight	Contribution
`structure_score`	60.0	0.15	9.00
`security_score`	100.0	0.25	25.00
`testing_score`	100.0	0.20	20.00
`documentation_score`	75.0	0.15	11.25
`practices_score`	81.0	0.15	12.15
`code_quality`	80.0	0.10	8.00
Overall		1.00	85.4

security_score may be inflated — optional security scanners were skipped on this fast scan

Severity distribution — click a segment to filter

Active filters: excluding tests × Reset all

Severity: Critical 0 High 243 Medium 26 Low 129 9-Layer: Software Security Quality Integrity Frontend Hardware Data Network Cicd Source: Legacy 191 9-layer 242 Crowd 0 Layer: Quality 205 Security 141 Software 29 Frontend 2 Cicd 6 Api 50

Exclude dismissed / FP Exclude test files

Bug-class explainers. Each card groups findings of the same shape — these are the patterns most likely to ship to prod and reappear in future scans unless you systematically fix the cause, not just the instance.

Fragile runtime 161 findings

What it is: Code that runs but breaks under predictable input — division by zero, missing keys, unbounded loops, off-by-one slicing.

Why it matters: Reaches production undetected because happy-path tests pass. First user with a weird input crashes the request.

How AI causes it: AI loves writing the happy path; doesn't probe edge cases unless explicitly asked.

Fix approach: Add property-based tests. Wrap external inputs with explicit validators. Use the framework's typed deserializer (Pydantic, attrs).

12 matching findings on this repo

medium [MINED109] Mutable default argument in `validate` (dict): `def validate(... = [… fastapi/_compat/v2.py:173
medium [MINED109] Mutable default argument in `read_items` (list): `def read_items(...… docs_src/query_params_str_validations/tutorial012…:9
medium [MINED109] Mutable default argument in `read_items` (list): `def read_items(...… docs_src/query_params_str_validations/tutorial013…:9
medium [MINED111] Bare except continues silently: Bare `except:` (or `except Exception… tests/test_ws_router.py:245
medium [MINED111] Bare except continues silently: Bare `except:` (or `except Exception… fastapi/concurrency.py:30
medium [MINED111] Bare except continues silently: Bare `except:` (or `except Exception… fastapi/encoders.py:346
medium [MINED111] Bare except continues silently: Bare `except:` (or `except Exception… fastapi/routing.py:270
medium Public web service has no security.txt .well-known/security.txt
medium Public web app has no Content Security Policy index.html
medium React interval is created without an explicit cleanup docs/en/docs/js/custom.js:139
medium [SEC134] AI scaffold leftover — Lorem ipsum / example.com / John Doe in code: L… docs_src/security/tutorial002_py310.py:19
medium [SEC134] AI scaffold leftover — Lorem ipsum / example.com / John Doe in code: L… docs_src/security/tutorial002_an_py310.py:21

View all fragile runtime findings →

Legacy markers 7 findings

What it is: TODO, FIXME, XXX, HACK comments. Often indicate a known-broken path the author meant to fix.

Why it matters: Each marker is an unfinished thought. Production code shouldn't ship with debt that's documented but not tracked.

How AI causes it: AI mirrors the style of the codebase, so existing TODOs propagate into new code.

Fix approach: Convert each into a ticket. Delete the comment when the ticket lands. Use a pre-commit hook to block new TODOs without an issue link.

7 matching findings on this repo

low Legacy-named symbol `test_upload_file_invalid_pydantic_v2` in tests/test_datast…
low Legacy-named symbol `test_discriminator_pydantic_v2` in tests/test_union_body_d…
low Legacy-named symbol `model_copy` in docs_src/body_updates/tutorial002_py310.py:…
low Legacy-named symbol `annotation_is_pydantic_v1` in fastapi/utils.py:14
low Legacy-named symbol `annotation_is_pydantic_v1` in fastapi/_compat/__init__.py:2
low Legacy-named symbol `annotation_is_pydantic_v1` in fastapi/_compat/shared.py:202
low Legacy-named symbol `typing_deprecated` in fastapi/openapi/models.py:14

View all legacy markers findings →

Commented-out code 6 findings

What it is: Lines of source that were intentionally disabled but never deleted.

Why it matters: Git already remembers history — commented code rots, becomes wrong, and adds noise to diffs.

How AI causes it: AI sometimes comments out broken code instead of fixing it. Reviewers approve out of inertia.

Fix approach: Delete. Trust `git log`. If you really need to remember, save it in a notes file under `docs/`.

6 matching findings on this repo

info Commented-code block (5 lines) in tests/test_schema_extra_examples.py:54
info Commented-code block (5 lines) in scripts/docs.py:170
info Commented-code block (19 lines) in fastapi/applications.py:1040
info Commented-code block (7 lines) in fastapi/routing.py:538
info Commented-code block (6 lines) in fastapi/concurrency.py:21
info Commented-code block (5 lines) in fastapi/_compat/v2.py:226

View all commented-out code findings →

Config drift 8 findings

What it is: Settings duplicated across env files, Docker compose, K8s, and code defaults, all with slightly different values.

Why it matters: Production behaviour depends on whichever copy your loader reads first. Subtle bugs in staging that don't reproduce in dev.

How AI causes it: AI writes new config from memory rather than reading the existing source.

Fix approach: Pick one source of truth (env vars + a settings module). Have every other place import from there. Lint for duplicates in CI.

8 matching findings on this repo

high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_co… docs_src/path_operation_configuration/tutorial002…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_co… docs_src/path_operation_configuration/tutorial004…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_co… docs_src/path_operation_configuration/tutorial005…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_co… docs_src/path_operation_configuration/tutorial001…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_co… docs_src/path_operation_configuration/tutorial003…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_ad… docs_src/path_operation_advanced_configuration/tu…:15
high FastAPI POST `create_item` without auth dependency — docs_src/path_operation_ad… docs_src/path_operation_advanced_configuration/tu…:13
high FastAPI POST `<anonymous>` without auth dependency — docs_src/path_operation_ad… docs_src/path_operation_advanced_configuration/tu…:17

View all config drift findings →

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