Starlette < 1.0.1 is affected by CVE-2026-48710 ("BadHost", CWE-444).
The HTTP Host header was not validated before being used to rebuild
`request.url`, so a malformed Host could make `request.url.path` desync
from the raw ASGI path the router actually dispatched. Middleware and
endpoints that apply path-based authorization off `request.url` (rather
than `scope["path"]`) can therefore be bypassed.
Hermes pulls Starlette transitively, never directly:
- [web] -> fastapi==0.133.1 (starlette>=0.40.0, no upper bound)
- [mcp] -> mcp==1.26.0 + sse-starlette (starlette>=0.27 / >=0.49.1)
- [computer-use] -> mcp==1.26.0
- [dev] -> mcp==1.26.0
A fresh resolve landed starlette 0.52.1 — vulnerable. With no upper
bound on the transitive specs, pip/uv could resolve any pre-1.0.1
release on a fresh install.
Fix: pin starlette==1.0.1 directly in every extra that exposes a
Starlette-backed server surface, regenerate uv.lock (only starlette
moves: 0.52.1 -> 1.0.1, hash-verified), and mirror the pin in the
lazy-install map (tools/lazy_deps.py `tool.dashboard`) so `hermes`
on-demand dashboard installs can't re-resolve a vulnerable version.
1.0.1 is the advisory's named fix floor and the oldest patched release
(more bake time than 1.1.0/1.2.0, which are days old); it satisfies
every carrier constraint and our requires-python>=3.11.
Scope note: this is a dependency-level fix complementing the
application-layer Host-header validator added in #34162
(`hermes_cli/web_server.py` `_is_accepted_host`). Defense in depth at
both the framework and app layers.
Guards: two invariant tests in tests/test_packaging_metadata.py assert
every server-surface extra pins starlette and that pyproject + uv.lock
both resolve >= the 1.0.1 CVE floor — a dropped pin or stale lock fails
in CI instead of shipping the bypass.
Closes#35067
0437137fff