CVE-2026-73649: Patch for prototype pollution via prototype chain access guard

Vulnerability Overview Vulnerability Title: Guard prototype chain access to prevent prototype pollution #192 CVE ID: CVE-2026-73649 Vulnerability Description: This vulnerability pertains to the protection of prototype chain access to prevent prototype pollution. Specifically, it addresses the unintended or malicious traversal of object prototype properties (such as , , ) during reference resolution and assignment. Scope of Impact Affected Module: Affected Functionality: Centralized handling of prototype key detection and helper functions Impact Scenario: Prototype pollution may occur via prototype chain access during reference resolution and assignment Remediation New Module: Added new module to centrally handle prototype key detection and helper functions Reference Updates: Updated to import the guard and block dangerous top-level or path accessors. This includes checks before reading context keys, property lookups, index lookups, and method calls, and throws a when unsafe method calls occur Compilation Settings Updates: Updated to use shared guard helper functions, removing redundant prototype checking logic. This includes blocking unsafe setting paths and guarding against unknown path resolution Unit Tests: Added unit tests in covering prototype chain protection scenarios, including top-level references, , index/property forms, inherited constructor/prototype exposure, preservation of fields, and function prototype paths POC Code / Exploit Code Code Snippet: Additional Information Author: shepherdwind Submission Date: Jul 14 Reviewer: chatgpt-codex-connector[bot] Status: Merged Related Tags: codex Related Projects: None yet Related Milestones: None yet Development Status: Successfully merging this pull request may close these issues. Summary This vulnerability is addressed by adding a new module and updating references to centrally handle prototype key detection and helper functions, thereby preventing prototype pollution. The remediation includes updating compilation settings and adding unit tests to ensure the security of prototype chain access.

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CVE-2026-73649: Patch for prototype pollution via prototype chain access guard

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