CVE-2026-107727
lowStrawberry GraphQL is a library for creating GraphQL APIs.
Strawberry GraphQL is a library for creating GraphQL APIs. From 0.312.3 until 0.327.2, the legacy graphql-ws subscription handler in strawberry/subscriptions/protocols/graphql_ws/handlers.py does not remove naturally completed operations from self.tasks and self.subscriptions. When max_subscriptions_per_connection is configured, a client on a persistent WebSocket connection can use distinct operation IDs for one-shot subscriptions to fill the connection's configured slots even after those subscriptions send complete, causing later legitimate operations on that connection to be rejected with Subscription limit reached. The modern graphql-transport-ws protocol and deployments without the configured per-connection cap are not affected. This issue is fixed in version 0.327.2.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/strawberry-graphql/strawberry/commit/24c5e46d57f7ad4f77e6e01fb8ae482dd1... security-advisories@github.com
- https://github.com/strawberry-graphql/strawberry/pull/4610 security-advisories@github.com
- https://github.com/strawberry-graphql/strawberry/releases/tag/0.327.2 security-advisories@github.com
- https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-m952-2w3f-6r8h security-advisories@github.com
- https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-m952-2w3f-6r8h 134c704f-9b21-4f2e-91b3-4a467353bcc0