high7.5
CVE-2026-35523
strawberry-graphql: Authentication bypass via legacy graphql-ws WebSocket subprotocol
Impact
Strawberry GraphQL is a library for creating GraphQL APIs. Strawberry up until version 0.312.3 is vulnerable to an authentication bypass on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler does not verify that a connection_init handshake has been completed before processing start (subscription) messages. This allows a remote attacker to skip the on_ws_connect authentication hook entirely by connecting with the graphql-ws subprotocol and sending a start message directly, without ever sending connection_init. This vulnerability is fixed in 0.312.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | strawberry-graphql | <= 0.312.2 | 0.312.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Strawberry | Strawberry Graphql | before 0.312.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-vpwc-v33q-mq89
- https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89
- https://github.com/strawberry-graphql/strawberry/commit/0977a4e6b41b7cfe3e9d8ba84a43458a2b0c54c2
- https://github.com/strawberry-graphql/strawberry/releases/tag/0.312.3
- https://nvd.nist.gov/vuln/detail/CVE-2026-35523
- https://github.com/pypa/advisory-database/tree/main/vulns/strawberry-graphql/PYSEC-2026-133.yaml