The Python micro framework for building web applications.
This report summarizes scanner evidence for pallets/flask, a Python project with 74,995 GitHub stars. SynthScan examined 19,960 lines of code across 139 source files, recording 342 pattern matches distributed across 10 syntactic categories. The legacy adjusted pattern signal is 19.4 (Elevated pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Can maintainers explain intent, assumptions, and trade-offs? 242 finding(s).
Are imports declared and package/API names verified? 79 finding(s).
Are wrappers, guards, and repeated structures necessary? 235 finding(s).
Which changes need focused human review? 342 finding(s).
This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 342 distinct pattern matches across 10 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | tests/test_basic.py | 1399 | def test_build_error_handler_reraise(app): | CODE |
| LOW⚡ | tests/test_basic.py | 1401 | def handler_raises_build_error(error, endpoint, values): | CODE |
| LOW⚡ | tests/test_basic.py | 1410 | def test_url_for_passes_special_values_to_build_error_handler(app): | CODE |
| LOW⚡ | tests/test_basic.py | 1457 | def test_static_url_empty_path(app): | CODE |
| LOW⚡ | tests/test_basic.py | 1464 | def test_static_url_empty_path_default(app): | CODE |
| LOW⚡ | tests/test_basic.py | 1471 | def test_static_folder_with_pathlib_path(app): | CODE |
| LOW⚡ | tests/test_basic.py | 1480 | def test_static_folder_with_ending_slash(): | CODE |
| LOW | tests/test_basic.py | 43 | def test_options_on_multiple_rules(app, client): | CODE |
| LOW | tests/test_basic.py | 70 | def test_method_route_no_methods(app): | CODE |
| LOW | tests/test_basic.py | 75 | def test_provide_automatic_options_attr_disable( | CODE |
| LOW | tests/test_basic.py | 89 | def test_provide_automatic_options_attr_enable( | CODE |
| LOW | tests/test_basic.py | 106 | def test_provide_automatic_options_arg_disable( | CODE |
| LOW | tests/test_basic.py | 119 | def test_provide_automatic_options_method_disable( | CODE |
| LOW | tests/test_basic.py | 155 | def test_disallow_string_for_allowed_methods(app): | CODE |
| LOW | tests/test_basic.py | 291 | def test_session_using_application_root(app, client): | CODE |
| LOW | tests/test_basic.py | 313 | def test_session_using_session_settings(app, client): | CODE |
| LOW | tests/test_basic.py | 356 | def test_session_using_samesite_attribute(app, client): | CODE |
| LOW | tests/test_basic.py | 396 | def test_session_secret_key_fallbacks(app, client) -> None: | CODE |
| LOW | tests/test_basic.py | 470 | def test_session_special_types(app, client): | CODE |
| LOW | tests/test_basic.py | 501 | def test_session_cookie_setting(app): | CODE |
| LOW | tests/test_basic.py | 603 | def test_session_refresh_vary(app, client): | CODE |
| LOW | tests/test_basic.py | 735 | def test_request_preprocessing_early_return(app, client): | CODE |
| LOW | tests/test_basic.py | 762 | def test_after_request_processing(app, client): | CODE |
| LOW | tests/test_basic.py | 777 | def test_teardown_request_handler(app, client): | CODE |
| LOW | tests/test_basic.py | 795 | def test_teardown_request_handler_debug_mode(app, client): | CODE |
| LOW | tests/test_basic.py | 813 | def test_teardown_request_handler_error(app, client): | CODE |
| LOW | tests/test_basic.py | 851 | def test_before_after_request_order(app, client): | CODE |
| LOW | tests/test_basic.py | 927 | def test_error_handling_processing(app, client): | CODE |
| LOW | tests/test_basic.py | 948 | def test_baseexception_error_handling(app, client): | CODE |
| LOW | tests/test_basic.py | 959 | def test_before_request_and_routing_errors(app, client): | CODE |
| LOW | tests/test_basic.py | 989 | def test_http_error_subclass_handling(app, client): | CODE |
| LOW | tests/test_basic.py | 994 | def handle_forbidden_subclass(e): | CODE |
| LOW | tests/test_basic.py | 1021 | def test_errorhandler_precedence(app, client): | CODE |
| LOW | tests/test_basic.py | 1058 | def test_trap_bad_request_key_error(app, client, debug, trap, expect_key, expect_abort): | CODE |
| LOW | tests/test_basic.py | 1089 | def test_trapping_of_all_http_exceptions(app, client): | CODE |
| LOW | tests/test_basic.py | 1100 | def test_error_handler_after_processor_error(app, client): | CODE |
| LOW | tests/test_basic.py | 1129 | def test_enctype_debug_helper(app, client): | CODE |
| LOW | tests/test_basic.py | 1238 | def test_response_type_errors(): | CODE |
| LOW | tests/test_basic.py | 1309 | def test_make_response_with_response_instance(app, req_ctx): | CODE |
| LOW | tests/test_basic.py | 1331 | def test_jsonify_no_prettyprint(app, compact): | CODE |
| LOW | tests/test_basic.py | 1355 | def test_jsonify_args_and_kwargs_check(app, req_ctx): | CODE |
| LOW | tests/test_basic.py | 1446 | def test_static_url_path_with_ending_slash(): | CODE |
| LOW | tests/test_basic.py | 1491 | def test_static_route_with_host_matching(): | CODE |
| LOW | tests/test_basic.py | 1529 | def test_server_name_matching( | CODE |
| LOW | tests/test_basic.py | 1565 | def test_server_name_subdomain(): | CODE |
| LOW | tests/test_basic.py | 1611 | def test_exception_propagation(app, client, key): | CODE |
| LOW | tests/test_basic.py | 1631 | def test_werkzeug_passthrough_errors( | CODE |
| LOW | tests/test_basic.py | 1674 | def test_inject_blueprint_url_defaults(app): | CODE |
| LOW | tests/test_basic.py | 1707 | def test_no_setup_after_first_request(app, client): | CODE |
| LOW | tests/test_basic.py | 1722 | def test_routing_redirect_debugging(monkeypatch, app, client): | CODE |
| LOW | tests/test_basic.py | 1742 | def test_route_decorator_custom_endpoint(app, client): | CODE |
| LOW | tests/test_basic.py | 1775 | def test_g_iteration_protocol(app_ctx): | CODE |
| LOW | tests/test_basic.py | 1783 | def test_subdomain_basic_support(): | CODE |
| LOW | tests/test_basic.py | 1816 | def test_subdomain_matching_with_ports(): | CODE |
| LOW | tests/test_basic.py | 1830 | def test_subdomain_matching_other_name(matching): | CODE |
| LOW | tests/test_basic.py | 1865 | def test_multi_route_class_views(app, client): | CODE |
| LOW | tests/test_basic.py | 1962 | def test_app_freed_on_zero_refcount(): | CODE |
| LOW | tests/test_signals.py | 25 | def test_before_render_template(): | CODE |
| LOW | tests/test_signals.py | 95 | def test_request_exception_signal(): | CODE |
| LOW | tests/test_signals.py | 163 | def test_appcontext_tearing_down_signal(app, client): | CODE |
| 150 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | tests/test_request.py | 1 | CODE | |
| LOW | tests/test_reqctx.py | 1 | CODE | |
| LOW | tests/test_cli.py | 523 | CODE | |
| LOW | tests/test_apps/helloworld/wsgi.py | 1 | CODE | |
| LOW | tests/type_check/typing_route.py | 1 | CODE | |
| LOW | tests/type_check/typing_app_decorators.py | 1 | CODE | |
| LOW | tests/type_check/typing_error_handler.py | 1 | CODE | |
| LOW | examples/javascript/js_example/__init__.py | 5 | CODE | |
| LOW | src/flask/logging.py | 1 | CODE | |
| LOW | src/flask/signals.py | 1 | CODE | |
| LOW | src/flask/sessions.py | 1 | CODE | |
| LOW | src/flask/config.py | 1 | CODE | |
| LOW | src/flask/templating.py | 1 | CODE | |
| LOW | src/flask/globals.py | 1 | CODE | |
| LOW | src/flask/__init__.py | 1 | CODE | |
| LOW | src/flask/__init__.py | 2 | CODE | |
| LOW | src/flask/__init__.py | 3 | CODE | |
| LOW | src/flask/__init__.py | 4 | CODE | |
| LOW | src/flask/__init__.py | 5 | CODE | |
| LOW | src/flask/__init__.py | 6 | CODE | |
| LOW | src/flask/__init__.py | 7 | CODE | |
| LOW | src/flask/__init__.py | 8 | CODE | |
| LOW | src/flask/__init__.py | 9 | CODE | |
| LOW | src/flask/__init__.py | 10 | CODE | |
| LOW | src/flask/__init__.py | 11 | CODE | |
| LOW | src/flask/__init__.py | 12 | CODE | |
| LOW | src/flask/__init__.py | 13 | CODE | |
| LOW | src/flask/__init__.py | 14 | CODE | |
| LOW | src/flask/__init__.py | 15 | CODE | |
| LOW | src/flask/__init__.py | 16 | CODE | |
| LOW | src/flask/__init__.py | 17 | CODE | |
| LOW | src/flask/__init__.py | 18 | CODE | |
| LOW | src/flask/__init__.py | 19 | CODE | |
| LOW | src/flask/__init__.py | 20 | CODE | |
| LOW | src/flask/__init__.py | 21 | CODE | |
| LOW | src/flask/__init__.py | 22 | CODE | |
| LOW | src/flask/__init__.py | 23 | CODE | |
| LOW | src/flask/__init__.py | 24 | CODE | |
| LOW | src/flask/__init__.py | 25 | CODE | |
| LOW | src/flask/__init__.py | 26 | CODE | |
| LOW | src/flask/__init__.py | 27 | CODE | |
| LOW | src/flask/__init__.py | 28 | CODE | |
| LOW | src/flask/__init__.py | 29 | CODE | |
| LOW | src/flask/__init__.py | 30 | CODE | |
| LOW | src/flask/__init__.py | 31 | CODE | |
| LOW | src/flask/__init__.py | 32 | CODE | |
| LOW | src/flask/__init__.py | 33 | CODE | |
| LOW | src/flask/__init__.py | 34 | CODE | |
| LOW | src/flask/__init__.py | 35 | CODE | |
| LOW | src/flask/__init__.py | 36 | CODE | |
| LOW | src/flask/__init__.py | 37 | CODE | |
| LOW | src/flask/__init__.py | 38 | CODE | |
| LOW | src/flask/__init__.py | 39 | CODE | |
| LOW | src/flask/blueprints.py | 1 | CODE | |
| LOW | src/flask/blueprints.py | 11 | CODE | |
| LOW | src/flask/cli.py | 1 | CODE | |
| LOW | src/flask/cli.py | 810 | CODE | |
| LOW | src/flask/wrappers.py | 1 | CODE | |
| LOW | src/flask/app.py | 1 | CODE | |
| LOW | src/flask/debughelpers.py | 1 | CODE | |
| 14 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | tests/test_basic.py | 826 | except Exception: | CODE |
| HIGH | tests/test_basic.py | 838 | except Exception: | CODE |
| HIGH | tests/test_reqctx.py | 38 | except Exception: | CODE |
| HIGH | tests/test_reqctx.py | 57 | except Exception: | CODE |
| HIGH | tests/test_appctx.py | 66 | except Exception: | CODE |
| HIGH | tests/test_appctx.py | 85 | except Exception: | CODE |
| HIGH | src/flask/config.py | 163 | except Exception: | CODE |
| HIGH | src/flask/cli.py | 1097 | except ValueError: | CODE |
| HIGH | src/flask/cli.py | 1035 | except ImportError: | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH⚡ | tests/test_reqctx.py | 23 | ctx.push() | CODE |
| HIGH⚡ | tests/test_reqctx.py | 126 | ctx.push() | CODE |
| HIGH⚡ | tests/test_reqctx.py | 140 | ctx.push() | CODE |
| HIGH | src/flask/app.py | 1596 | ctx.push() | CODE |
| HIGH | src/flask/ctx.py | 507 | self.push() | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | examples/celery/requirements.txt | 1 | # | COMMENT |
| LOW | examples/celery/requirements.txt | 21 | # click-plugins | COMMENT |
| LOW | examples/celery/requirements.txt | 41 | # werkzeug | COMMENT |
| LOW | src/flask/views.py | 61 | #: decorator. | COMMENT |
| LOW | src/flask/sansio/app.py | 161 | #: | COMMENT |
| LOW | src/flask/sansio/app.py | 181 | #: .. versionadded:: 0.10 | COMMENT |
| LOW | src/flask/sansio/app.py | 201 | #: If this is enabled and PROPAGATE_EXCEPTIONS is not changed from the | COMMENT |
| LOW | src/flask/sansio/app.py | 241 | #: :meth:`create_jinja_environment`. Changing these options after | COMMENT |
| LOW | src/flask/sansio/app.py | 341 | """ | COMMENT |
| LOW | src/flask/sansio/app.py | 361 | self.teardown_appcontext_funcs: list[ft.TeardownCallable] = [] | COMMENT |
| LOW | src/flask/sansio/app.py | 381 | #: The key must match the name of the extension module. For example in | COMMENT |
| LOW | src/flask/sansio/scaffold.py | 101 | COMMENT | |
| LOW | src/flask/sansio/scaffold.py | 121 | #: This data structure is internal. It should not be modified | COMMENT |
| LOW | src/flask/sansio/scaffold.py | 141 | COMMENT | |
| LOW | src/flask/sansio/scaffold.py | 161 | #: | COMMENT |
| LOW | src/flask/sansio/scaffold.py | 181 | #: directly and its format may change at any time. | COMMENT |
| LOW | src/flask/sansio/scaffold.py | 201 | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | tests/test_basic.py | 826 | except Exception: | CODE |
| LOW | tests/test_basic.py | 838 | except Exception: | CODE |
| LOW⚡ | tests/test_reqctx.py | 38 | except Exception: | CODE |
| LOW | tests/test_reqctx.py | 57 | except Exception: | CODE |
| LOW⚡ | tests/test_appctx.py | 66 | except Exception: | CODE |
| LOW⚡ | tests/test_appctx.py | 85 | except Exception: | CODE |
| LOW | src/flask/config.py | 163 | except Exception: | CODE |
| LOW | src/flask/cli.py | 650 | except Exception: | CODE |
| LOW | src/flask/cli.py | 955 | except Exception as e: | CODE |
| LOW | src/flask/app.py | 1017 | except Exception as e: | CODE |
| LOW⚡ | src/flask/app.py | 1045 | except Exception: | CODE |
| LOW | src/flask/app.py | 1598 | except Exception as e: | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | src/flask/cli.py | 41 | CODE | |
| LOW | src/flask/cli.py | 333 | CODE | |
| LOW | src/flask/app.py | 1224 | CODE | |
| LOW | src/flask/app.py | 1366 | CODE | |
| LOW | src/flask/app.py | 1420 | CODE | |
| LOW | src/flask/sansio/blueprints.py | 273 | CODE | |
| LOW | src/flask/sansio/app.py | 869 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | src/flask/blueprints.py | 19 | CODE | |
| LOW | src/flask/app.py | 308 | CODE | |
| LOW | src/flask/sansio/blueprints.py | 174 | CODE | |
| LOW | src/flask/sansio/app.py | 280 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | src/flask/app.py | 868 | """This method is called whenever an exception occurs that | STRING |
| MEDIUM⚡ | src/flask/app.py | 1054 | """This method is called to create the default ``OPTIONS`` response. | STRING |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | src/flask/sessions.py | 101 | """The basic interface you have to implement in order to replace the | STRING |
| MEDIUM | src/flask/app.py | 1395 | """Can be overridden in order to modify the response object | STRING |