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Vulnerability · Published Oct 8, 2026 · Assigned by GitHub_M

CVE-2026-107727Strawberry legacy graphql-ws retains naturally completed subscription slots

Low 3.7

In plain English

A low-severity uncontrolled resource consumption in strawberry from strawberry-graphql. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.4%top 62.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIstrawberry-graphql0.327.2GHSA-m952-2w3f-6r8h
PyPIstrawberry-graphql0.327.2PYSEC-2026-4302

Affected products (as reported)

VendorProductVersions
strawberry-graphql strawberry >= 0.312.3, < 0.327.2

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References