High 7.5Published Oct 29, 2026

CVE-2026-119286GraphQL-core: Denial of service via memory leak in aborted validations

Updated under an hour ago (Oct 30, 2026, 2:30 AM ET)

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It affects graphql-python graphql-core. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Start free and add your stackFree account, 3 products Every CVE for graphql-python graphql-core Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-401
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Received
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

graphql-python graphql-core graphql_python:graphql_core (from the name)	from 3.3.0a3, < 3.3.1	CNA record

References

References

https://github.com/graphql-python/graphql-core/security/advisories/GHSA-mpqx-q82w-9x46	x-refsource-confirm
https://github.com/graphql-python/graphql-core/issues/287	x-refsource-misc
https://github.com/graphql-python/graphql-core/pull/288	x-refsource-misc
https://github.com/graphql-python/graphql-core/commit/3c319fd9f4b8f6c9db4189520561bf8dd0e70be9	x-refsource-misc
https://github.com/graphql-python/graphql-core/releases/tag/v3.3.1	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.