CVE-2026-48710
MEDIUM(6.5)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS 6.5 — Mittel
EPSS-Score
1%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
6.5
Technische Schwere
Beschreibung
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.
GitHub Advisories
Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks
Referenzen
- https://badhost.org
- https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f9464...
- https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
- https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-1...
- 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://access.redhat.com/security/cve/CVE-2026-48710
- https://badhost.org
- https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f9464...