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Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorit…

Medium CVSS 6.5
CVECVE-2026-48710
First seen2026-07-21 20:15 UTC
Disclosed2026-05-26 22:16 UTC
Last updated2026-07-21 20:15 UTC
Channel statusauto

Summary

Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, 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)…

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • :
Lint boundary warnings (4)

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://badhost.org
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.secwest.net/starlette
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD