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 Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade py312-dj52-strawberry-graphqlUpgrade py314-strawberry-graphqlUpgrade py314-dj52-strawberry-graphqlUpgrade py310-dj52-strawberry-graphqlUpgrade py311-dj52-strawberry-graphqlUpgrade py313-strawberry-graphqlUpgrade py313-dj52-strawberry-graphqlUpgrade py311-strawberry-graphqlUpgrade py313t-dj52-strawberry-graphqlUpgrade py310-strawberry-graphqlUpgrade py313t-strawberry-graphqlUpgrade py312-strawberry-graphql | Apr 20, 2026 | Apr 17, 2026 |
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