septr — runtime security middleware for Python

Protects FastAPI and Flask apps at runtime: secrets leaking in responses, BOLA/IDOR, missing auth, business-logic tampering, PII, prompt injection, SSRF, and missing rate limits. Auto-verified against the Septr backend, with per-engine SOC 2 evidence for your dashboard.

Install

pip install septr

Add your key to .env:

SEPTR_API_KEY=septr_live_...

FastAPI

from fastapi import FastAPI
from septr.adapters.fastapi import SeptrASGIMiddleware
import os

app = FastAPI()

app.add_middleware(
    SeptrASGIMiddleware,
    api_key=os.getenv("SEPTR_API_KEY"),
)

Flask

from flask import Flask
from septr.adapters.flask import SeptrFlask
import os

app = Flask(__name__)
# ... your routes ...
app.wsgi_app = SeptrFlask(app.wsgi_app, {"apiKey": os.getenv("SEPTR_API_KEY")})

Config

Option	Type	Default	Description
`apiKey`	str	env `SEPTR_API_KEY`	Backend API key
`strictMode`	bool	`False`	Block instead of detect
`secrets`	bool	`True`	Secret/PII detection + response scrubbing
`bola`	bool	`True`	BOLA/IDOR detection
`rateLimit`	bool	`True`	Per-route rate limiting
`inputSanitize`	bool	`True`	SQLi/XSS/NoSQLi sanitization
`ssrf`	bool	`True`	SSRF heuristics
`promptInjection`	bool	`True`	Prompt-injection shielding
`aiRateLimit`	bool	`True`	Rate limiting for AI endpoints
`tamper`	bool	`True`	Business-logic tamper detection
`missingAuth`	bool	`True`	Missing-auth detection
`stripFields`	list[str]	`[]`	Fields to strip from responses
`telemetry_url`	str	`https://api.septr.com/v1/events`	Telemetry endpoint

Environment variables

SEPTR_API_KEY — your project key
SEPTR_SILENCE_ENV_WARNING — set to 1 to silence the fail-loud missing-key warning

License

MIT

Development Status
- 4 - Beta
Intended Audience
- Developers
License
- OSI Approved :: MIT License
Programming Language
- Python :: 3
Topic
- Security

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