CVE-2026-107376

CVE-2026-107376 · webonyx graphql-php: Unbounded recursion in parser causes stack overflow on crafted nested input

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webonyx graphql-php is a PHP implementation of the GraphQL specification. Prior to 15.32.3, GraphQL\Language\Parser performs recursive descent without a recursion limit in parseSelectionSet, parseValueLiteral, and parseTypeReference. A remote attacker can submit deeply nested selection sets, object or list values, or list types that exhaust the PHP process stack during pre-validation parsing, before query validation and complexity controls run. The resulting SIGSEGV can terminate PHP-FPM workers or long-running Swoole, RoadRunner, ReactPHP, or CLI processes and cannot be caught by application-level exception handling. This issue is fixed in version 15.32.3.

CVSS 8.2 · High · EPSS 0.4% · Fix available

Published

2026-10-08T17:49:57.113Z

Updated

2026-10-08T18:39:56.356Z

Stack: php

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