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

Quick assessment

Affected
webonyx graphql-php
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Webonyx graphql-php 是 GraphQL 规范的 PHP 实现。在版本 15.32.3 之前，GraphQL\Language\Parser 中的 parseSelectionSet、parseValueLiteral 和 parseTypeReference 方法在执行递归下降解析时未设置递归深度限制。远程攻击者可通过提交深度嵌套的选择集（selection sets）、对象或列表值，或列表类型，在预验证阶段（即在查询验证和复杂度控制规则执行之前）耗尽 PHP 进程的栈空间，从而导致 SIGSE

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
webonyx graphql-php < 15.32.3 affected
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I. Basic Information for CVE-2026-107376

Vulnerability Information
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Vulnerability Title
webonyx graphql-php: Unbounded recursion in parser causes stack overflow on crafted nested input
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
webonyx graphql-php < 15.32.3 -

II. Public POCs for CVE-2026-107376

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III. Intelligence Information for CVE-2026-107376

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Other References for CVE-2026-107376 (4)

IV. Related Vulnerabilities

Same product: graphql-php
Same vendor: webonyx
Same weakness: CWE-674

V. Comments for CVE-2026-107376

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