GHSA-mhwj-73qx-jqxm: @theecryptochad/merge-guard has Prototype Pollution in its deepMerge() function

May 11, 2026

@theecryptochad/merge-guard versions prior to 1.0.1 are vulnerable to Prototype Pollution via the deepMerge() function. An attacker who controls the source object can inject __proto__ keys that mutate Object.prototype, affecting all objects in the Node.js runtime.

References

github.com/TheeCryptoChad/merge-guard/commit/25e4b4f2618578a656ef3cb4946a1b475f736736
github.com/TheeCryptoChad/merge-guard/security/advisories/GHSA-mhwj-73qx-jqxm
github.com/advisories/GHSA-mhwj-73qx-jqxm

Code Behaviors & Features

Detect and mitigate GHSA-mhwj-73qx-jqxm with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →