High severity7.5NVD Advisory· Published Apr 7, 2026· Updated Apr 17, 2026
CVE-2026-35523
CVE-2026-35523
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
strawberry-graphqlPyPI | < 0.312.3 | 0.312.3 |
Affected products
2- cpe:2.3:a:strawberry:strawberry_graphql:*:*:*:*:*:python:*:*Range: <0.312.3
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-vpwc-v33q-mq89ghsaADVISORY
- github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-35523ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/strawberry-graphql/PYSEC-2026-133.yamlghsaWEB
- github.com/strawberry-graphql/strawberry/commit/0977a4e6b41b7cfe3e9d8ba84a43458a2b0c54c2ghsaWEB
- github.com/strawberry-graphql/strawberry/releases/tag/0.312.3ghsaWEB
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