VDB
Sign up
MEDIUM6.3

PYSEC-2026-4046

djust: WebSocket/runtime reconstructed request omits the client Host, causing host/subdomain TenantResolvers to misresolve the tenant on the live path

Quick fix

PYSEC-2026-4046 — djust: upgrade to the fixed version with the command below.

pip install --upgrade 'djust>=1.0.7'

Details

### Impact The WebSocket `handle_mount` and `ViewRuntime._build_request` rebuild an `HttpRequest` via `RequestFactory().get(...)` with no `HTTP_HOST`, so `request.get_host()` defaulted to `"testserver"` on the live path. Host/subdomain/domain `TenantResolver`s then misresolved the tenant — `None` on the live path while the HTTP path resolved correctly. With `STRICT_MODE=False` the tenant-scoped managers returned unscoped rows (**cross-tenant disclosure**); with the default they returned an empty queryset (broken tenancy).

### Patches Fixed in **djust 1.0.7**. The handshake Host is extracted from the ASGI scope, validated against `ALLOWED_HOSTS` (the same logic as the CSWSH Origin gate, parsed with Django's `split_domain_port` so malformed Hosts are rejected at the boundary), and propagated — with the TLS scheme — into the reconstructed request, so live-path tenant resolution matches HTTP exactly.

### Workarounds No workaround on the live path short of upgrading. Most exposed when combined with `STRICT_MODE=False`.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/djust
Introduced in: 0Fixed in: 1.0.7
Fixpip install --upgrade 'djust>=1.0.7'

References