GHSA-HV3W-M4G2-5X77

Vulnerability from github – Published: 2026-04-06 18:00 – Updated: 2026-04-07 22:09
VLAI?
Summary
strawberry-graphql: Denial of Service via unbounded WebSocket subscriptions
Details

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.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.312.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "strawberry-graphql"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.312.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35526"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T18:00:29Z",
    "nvd_published_at": "2026-04-07T16:16:28Z",
    "severity": "HIGH"
  },
  "details": "Strawberry GraphQL\u0027s 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.\n\nAn 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.",
  "id": "GHSA-hv3w-m4g2-5x77",
  "modified": "2026-04-07T22:09:48Z",
  "published": "2026-04-06T18:00:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-hv3w-m4g2-5x77"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35526"
    },
    {
      "type": "WEB",
      "url": "https://github.com/strawberry-graphql/strawberry/commit/0977a4e6b41b7cfe3e9d8ba84a43458a2b0c54c2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/strawberry-graphql/strawberry"
    },
    {
      "type": "WEB",
      "url": "https://github.com/strawberry-graphql/strawberry/releases/tag/0.312.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "strawberry-graphql: Denial of Service via unbounded WebSocket subscriptions"
}


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