CVE-2026-35526: Strawberry Graphql

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Strawberry Strawberry Graphql: before 0.312.3 (fixed in 0.312.3)

Published 2026-04-07. Last modified 2026-06-17.