What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-08
• Weakness: CWE-674

Description

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.

Affected products

• webonyx graphql-php: before 15.32.3

References

• https://github.com/webonyx/graphql-php/commit/6c1d6009a0f7557f66753bcfd07badd15acf77f4
• https://github.com/webonyx/graphql-php/commit/7b7f2080ca5f7d5340a696fc5701b19a9222d2c2
• https://github.com/webonyx/graphql-php/releases/tag/v15.32.3
• https://github.com/webonyx/graphql-php/security/advisories/GHSA-r7cg-qjjm-xhqq
• https://github.com/webonyx/graphql-php/security/advisories/GHSA-r7cg-qjjm-xhqq

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