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.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 6a0aa20d-399f-11f1-8626-901b0edee044 advisory.

    The Strawberry GraphQL project reports:
    Strawberry up until version 0.312.3 is vulnerable to an authentication bypass             on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler             does not verify that a 'connection_init' handshake has been completed before             processing start (subscription) messages. This allows a remote attacker to skip             the 'on_ws_connect' authentication hook entirely by connecting with the             graphql-ws subprotocol and sending a start message directly, without ever             sending 'connection_init'.

            The graphql-transport-ws subprotocol handler is not affected, as it correctly             gates subscription operations on a connection_acknowledged flag. However, both             subprotocols are enabled by default in all framework integrations that support             websockets, and the subprotocol is selected by the client via the             Sec-WebSocket-Protocol header.

            Any application relying on 'on_ws_connect' for authentication or authorization             is affected.
    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.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-35526)

ID	Name	Product	Family	Severity
307389	FreeBSD : py-strawberry-graphql -- Multiple vulnerabilities (6a0aa20d-399f-11f1-8626-901b0edee044)	Nessus	FreeBSD Local Security Checks	high
440031	SCA: security update for strawberry-graphql (GHSA-hv3w-m4g2-5x77)	Tenable Cloud Security	SCA Checks	high
440031	SCA: security update for strawberry-graphql (GHSA-hv3w-m4g2-5x77)	Tenable Self-Hosted Container Security	SCA Checks	high

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CVE-2026-35526

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Tenable Plugins

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