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.
Metrics
Affected Vendors & Products
References
History
Fri, 17 Apr 2026 20:45:00 +0000
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Strawberry strawberry Graphql
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| CPEs | cpe:2.3:a:strawberry:strawberry_graphql:*:*:*:*:*:python:*:* | |
| Vendors & Products |
Strawberry strawberry Graphql
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Thu, 09 Apr 2026 08:30:00 +0000
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Strawberry
Strawberry strawberry |
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| Vendors & Products |
Strawberry
Strawberry strawberry |
Wed, 08 Apr 2026 16:15:00 +0000
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| Metrics |
ssvc
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Tue, 07 Apr 2026 18:00:00 +0000
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| Description | 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. | |
| Title | Strawberry GraphQL affected by a Denial of Service via unbounded WebSocket subscriptions | |
| Weaknesses | CWE-770 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-04-08T14:55:58.026Z
Reserved: 2026-04-03T02:15:39.281Z
Link: CVE-2026-35526
Updated: 2026-04-08T14:55:51.844Z
Status : Analyzed
Published: 2026-04-07T16:16:28.843
Modified: 2026-04-17T20:37:10.447
Link: CVE-2026-35526
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