PYSEC-2026-4036

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/djust/PYSEC-2026-4036.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-4036
Aliases
Published
2026-10-01T16:38:31Z
Modified
2026-10-01T17:45:03Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Summary
djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data
Details

Impact

djust.tenants isolation was enforced only on the HTTP path. The current tenant was stored in threading.local() and set exclusively by the HTTP-only TenantMiddleware, so on the live (WebSocket/SSE) path get_current_tenant() was always None during mount and every event handler — and the tenant-aware QuerySet manager failed OPEN (returned the unfiltered queryset, ignoring STRICT_MODE), disclosing every tenant's rows to whoever held the socket. threading.local was additionally shared across connections on the sync_to_async executor thread.

Patches

Fixed in djust 1.0.7. Tenant storage moved to a contextvars.ContextVar (per async task); the resolved tenant is bound around WS/SSE mount and every dispatch; both managers scope the base queryset once and fail CLOSED (.none() under the default STRICT_MODE); and system check S006 warns when STRICT_MODE=False.

Workarounds

No workaround on the live path short of upgrading.

References

Affected packages

PyPI / djust

Package

Name
djust
View open source insights on deps.dev
Purl
pkg:pypi/djust

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.0.7

Affected versions

0.*
0.1.0
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.2.0
0.2.1
0.2.2
0.3.0
0.3.1
0.3.2
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.9.0
0.9.1
0.9.2
0.9.4
0.9.5
0.9.6
0.9.7
1.*
1.0.0rc11
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/djust/PYSEC-2026-4036.yaml"