Memory Exhaustion Vulnerability in GraphQL-core Python Library
CVE-2026-119286

7.5HIGH

Key Information:

Vendor

Graphql-python

Status
Graphql-core
Vendor
CVE Published:
29 October 2026

What is CVE-2026-119286?

The GraphQL-core library, a Python implementation of GraphQL.js, suffers from a memory exhaustion vulnerability due to the misuse of a module-level ValidationAbortedError. In versions 3.3.0a3 through 3.3.1, the validate() function allows an unauthenticated client to submit small documents with more than 100 validation errors repeatedly. This results in unbounded memory growth before query execution, leading to potential exhaustion of worker memory. This issue has been addressed in version 3.3.1.

Affected Version(s)

graphql-core >= 3.3.0a3, < 3.3.1

References

https://github.com/graphql-python/graphql-core/security/a...
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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.