Starlette BadHost (CVE-2026-48710): one Host header bypasses auth in FastAPI, vLLM, MCP
X41 D-Sec discloses CVE-2026-48710 in Starlette <1.0.1: a Host-header re-parse desync that lets attackers forge request.url.path. Upgrade to 1.0.1.
X41 D-Sec discloses CVE-2026-48710 in Starlette <1.0.1: a Host-header re-parse desync that lets attackers forge request.url.path. Upgrade to 1.0.1.