CVE-2026-35526
HIGH
GHSA-hv3w-m4g2-5x77
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Tags
Description
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.
Analysis
Unauthenticated denial-of-service in Strawberry GraphQL WebSocket handlers allows remote attackers to crash Python servers via subscription flooding. The vulnerability affects both graphql-transport-ws and legacy graphql-ws protocol implementations, which fail to enforce per-connection subscription limits. …
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Remediation
Within 24 hours: identify all production systems running Strawberry GraphQL and verify WebSocket functionality status. Within 7 days: apply vendor-released patch to all affected Strawberry GraphQL deployments and test WebSocket subscription endpoints. …
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External POC / Exploit Code
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