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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/webonyx/graphql-php/commit/6c1d6009a0f7557f66753bcfd07badd15…
security-advisories@github.com
https://github.com/webonyx/graphql-php/commit/7b7f2080ca5f7d5340a696fc5701b19a9…
security-advisories@github.com
https://github.com/webonyx/graphql-php/releases/tag/v15.32.3
security-advisories@github.com
https://github.com/webonyx/graphql-php/security/advisories/GHSA-r7cg-qjjm-xhqq
security-advisories@github.com