CVE-2026-35523 json
Authentication bypass in strawberry-graphql via legacy graphql-ws WebSocket subprotocol
published 2026-04-06 7 mo ago modified 2026-06-17 4 mo ago also GHSA-vpwc-v33q-mq89 , PYSEC-2026-133 , EUVD-2026-19716
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 38%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi strawberry-graphql 0.312.3
- strawberry strawberry_graphql 0.312.3
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | strawberry-graphql | <0.312.3 |
0.312.3 |
Affected products
- strawberry-graphql strawberry
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
github.com
/strawberry-graphql/strawberry/commit/0977a4e6b41b7cfe3e9d8ba84a43458a2b0c54c2
web
-
github.com
/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89
web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-35523
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/strawberry-graphql/PYSEC-2026-133.yaml
web
-
github.com
/strawberry-graphql/strawberry
package
-
github.com
/strawberry-graphql/strawberry/releases/tag/0.312.3
web
Sources
- CVE List CVE-2026-35523
- GitHub Advisory GHSA-vpwc-v33q-mq89
- NVD CVE-2026-35523
- OSV PYSEC-2026-133
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