Resource exhaustion in Graphql-Python Graphql-Core

CVE-2026-119286

GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.3.0a3 until 3.3.1, validate() reuses a module-level ValidationAbortedError when a document exceeds max_errors. Python appends frames to the reused exception's traceback on every raise, retaining each document, validation context, and error set for the process lifetime. An unauthenticated client can repeatedly submit a small document with more than 100 validation errors to cause unbounded memory growth before query execution, eventually exhausting worker memory without disclosing or modifying data. This issue is fixed in version 3.3.1.

Vulnerability class: DoS (Denial of Service)

Published .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-119286?
CVE-2026-119286 is a high-severity vulnerability in Graphql-Python Graphql-Core, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-10-29.
How severe is CVE-2026-119286?
High severity. CVSS v3 base score is 7.5 out of 10.