webonyx graphql-php up to 15.32.2 Parser parseSelectionSet recursion

Summaryinfo

A vulnerability labeled as critical has been found in webonyx graphql-php up to 15.32.2. Affected is the function parseSelectionSet of the component Parser. Such manipulation leads to recursion. This vulnerability is uniquely identified as CVE-2026-107376. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in webonyx graphql-php up to 15.32.2. It has been rated as critical. Affected by this issue is the function parseSelectionSet of the component Parser. The manipulation with an unknown input leads to a recursion vulnerability. Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-107376 since 10/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 15.32.3 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• webonyx

Name

• graphql-php

Version

• 15.32.0
• 15.32.1
• 15.32.2

Website

• Product: https://github.com/webonyx/graphql-php/

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