chore(deps): update dependency starlette to v1 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
starlette (changelog)	==0.50.0 → ==1.0.1

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Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks

CVE-2026-48710 / GHSA-86qp-5c8j-p5mr

More information

Details

Summary

In affected versions, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header could make request.url.path differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on request.url (rather than the raw scope path) could therefore be bypassed.

Details

When a client requests http://example.com/foo, it sends:

GET /foo HTTP/1.1
Host: example.com

Affected versions reconstructed the URL by concatenating http://{host}{path} and re-parsing the result. The Host value is only valid as a uri-host [ ":" port ] per RFC 9112 §3.2, where uri-host follows the restricted host grammar of RFC 3986 §3.2.2. When it contains characters outside that grammar - notably /, ?, or # - those characters move the path/query/fragment boundaries during re-parsing, so the parsed request.url.path no longer matches the path the server actually received. For example:

GET /foo HTTP/1.1
Host: example.com/abc?bar=

reconstructs to http://example.com/abc?bar=/foo, whose parsed path is /abc - even though routing used the real path /foo. The router still dispatches to /foo and the endpoint executes, but any middleware or code that reads request.url.path sees /abc, so path-based authorization checks can be bypassed.

Impact

Any application running an affected version that relies on request.url (or request.url.path) for security-sensitive decisions is affected. The most common case is middleware that gates access to certain path prefixes based on request.url.path. Deployments fronted by a proxy or load balancer are mitigated only if that proxy rejects or normalizes the malformed Host header before forwarding and the application does not trust attacker-controlled host headers (e.g. X-Forwarded-Host) elsewhere.

Mitigation

Upgrade to a patched version, which validates the Host header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing request.url and falls back to scope["server"] for malformed values.

Severity

• CVSS Score: 6.5 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

• https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
• https://nvd.nist.gov/vuln/detail/CVE-2026-48710
• https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6
• https://badhost.org
• https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
• https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
• https://www.secwest.net/starlette
• https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
• https://github.com/advisories/GHSA-86qp-5c8j-p5mr

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

Kludex/starlette (starlette)

v1.0.1: Version 1.0.1

Compare Source

What's Changed

• Ignore malformed Host header when constructing request.url by @​Kludex in #​3279

Full Changelog: Kludex/starlette@1.0.0...1.0.1

v1.0.0: Version 1.0.0

Compare Source

Starlette 1.0 is here! 🎉

After nearly eight years since its creation, Starlette has reached its first stable release.

A special thank you to @​lovelydinosaur, the creator of Starlette, Uvicorn, HTTPX and MkDocs, whose work helped to lay the foundation for the modern async Python ecosystem. 🙏

Thank you to @​adriangb, @​graingert, @​agronholm, @​florimondmanca, @​aminalaee, @​tiangolo, @​alex-oleshkevich, @​abersheeran, and @​uSpike for helping make Starlette what it is today. And to all my sponsors - especially @​tiangolo, @​huggingface, and @​elevenlabs - thank you for your support!

Thank you to all 290+ contributors who have shaped Starlette over the years! ❤️

Read more on the blog post.

Check out the full release notes at https://www.starlette.io/release-notes/#​100-march-22-2026

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Full Changelog: Kludex/starlette@1.0.0rc1...1.0.0

v0.52.1: Version 0.52.1

Compare Source

What's Changed

• Only use typing_extensions in older Python versions by @​Kludex in #​3109

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Full Changelog: Kludex/starlette@0.52.0...0.52.1

v0.52.0: Version 0.52.0

Compare Source

In this release, State can be accessed using dictionary-style syntax for improved type safety (#​3036).

from collections.abc import AsyncIterator
from contextlib import asynccontextmanager
from typing import TypedDict

import httpx

from starlette.applications import Starlette
from starlette.requests import Request

class State(TypedDict):
    http_client: httpx.AsyncClient

@​asynccontextmanager
async def lifespan(app: Starlette) -> AsyncIterator[State]:
    async with httpx.AsyncClient() as client:
        yield {"http_client": client}

async def homepage(request: Request[State]):
    client = request.state["http_client"]
    # If you run the below line with mypy or pyright, it will reveal the correct type.
    reveal_type(client)  # Revealed type is 'httpx.AsyncClient'

See Accessing State for more details.

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Full Changelog: Kludex/starlette@0.51.0...0.52.0

v0.51.0: Version 0.51.0

Compare Source

Added

• Add allow_private_network in CORSMiddleware #​3065.

Changed

• Increase warning stacklevel on DeprecationWarning for wsgi module #​3082.

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New Contributors

• @​santibreo made their first contribution in #​3082
• @​iddqd888 made their first contribution in #​3083

Full Changelog: Kludex/starlette@0.50.0...0.51.0

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