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CVE-2026-35526— Strawberry GraphQL affected by a Denial of Service via unbounded WebSocket subscriptions

Quick assessment

Affected
strawberry-graphql strawberry
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Strawberry GraphQL是Strawberry GraphQL开源的一个利用类型注释的 Python GraphQL 库。 Strawberry GraphQL 0.312.3之前版本存在安全漏洞，该漏洞源于WebSocket订阅处理程序未限制每个连接的活跃订阅数量，可能导致未经身份验证的攻击者通过发送大量订阅消息导致服务器内存线性增长和事件循环饱和，最终造成服务器性能下降或内存耗尽崩溃。

CVSS 7.5 · High EPSS 0.27% · P19
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I. Basic Information for CVE-2026-35526

Vulnerability Information
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Vulnerability Title
Strawberry GraphQL affected by a Denial of Service via unbounded WebSocket subscriptions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Strawberry GraphQL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Strawberry GraphQL是Strawberry GraphQL开源的一个利用类型注释的 Python GraphQL 库。 Strawberry GraphQL 0.312.3之前版本存在安全漏洞，该漏洞源于WebSocket订阅处理程序未限制每个连接的活跃订阅数量，可能导致未经身份验证的攻击者通过发送大量订阅消息导致服务器内存线性增长和事件循环饱和，最终造成服务器性能下降或内存耗尽崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strawberry-graphql strawberry < 0.312.3 -

II. Public POCs for CVE-2026-35526

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III. Intelligence Information for CVE-2026-35526

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IV. Related Vulnerabilities

Same product: strawberry
Same vendor: strawberry-graphql
Same weakness: CWE-770

V. Comments for CVE-2026-35526

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