CVE-2026-35523
HIGH7.5EPSS 0.11%strawberry-graphql: Authentication bypass via legacy graphql-ws WebSocket subprotocol
Published: 4/6/2026Modified: 5/20/2026
Description
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 (2)
- PyPI/strawberry-graphqlfrom 0, < 0.312.3
- PyPI/strawberry-graphqlfrom 0, < 0.312.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-35523
- PATCHhttps://github.com/strawberry-graphql/strawberry
- WEBhttps://github.com/strawberry-graphql/strawberry/commit/0977a4e6b41b7cfe3e9d8ba84a43458a2b0c54c2
- WEBhttps://github.com/strawberry-graphql/strawberry/releases/tag/0.312.3
- WEBhttps://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89