Detections
Analytics
CVE-2026-48710
medium
Description
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) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, 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.
References
https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
https://latesthackingnews.com/2026/06/16/litellm-vulnerability-chain-ai-gateway-patch/
https://thehackernews.com/2026/06/litellm-flaw-cve-2026-42271-exploited.html
https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
https://www.secwest.net/starlette
https://www.cve.org/CVERecord?id=CVE-2026-48710
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json
https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6