CVE-2026-35526

Strawberry GraphQL is a library for creating GraphQL APIs. Prior to 0.312.3, Strawberry GraphQL's WebSocket subscription handlers for both the graphql-transport-ws and legacy graphql-ws protocols allocate an asyncio.Task and associated Operation object for every incoming subscribe message without enforcing any limit on the number of active subscriptions per connection. An unauthenticated attacker can open a single WebSocket connection, send connection_init, and then flood subscribe messages with unique IDs. Each message unconditionally spawns a new asyncio.Task and async generator, causing linear memory growth and event loop saturation. This leads to server degradation or an OOM crash. This vulnerability is fixed in 0.312.3.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-hv3w-m4g2-5x77	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:strawberry:strawberry_graphql:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-04-07 16:16

Updated : 2026-06-17 10:40

NVD link : CVE-2026-35526

Mitre link : CVE-2026-35526

CVE.ORG link : CVE-2026-35526

JSON object : View

Products Affected

strawberry

strawberry_graphql

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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