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**Name of the Vulnerable Software and Affected Versions** lodash versions prior to 4.18.0 **Description** The software contains a flaw related to template compilation. Specifically, insufficient validation of key names within the `options.imports` object used by the ` .template` function can allow an attacker to inject default-parameter expressions, leading to arbitrary code execution. The issue arises because validation applied to the `option` variable is not extended to the `options.imports` key names. Furthermore, the use of `assignInWith` can introduce vulnerabilities if `Object.prototype` has been compromised, potentially copying polluted keys into the imports object and ultimately executing malicious code. **Recommendations** Upgrade to version 4.18.0. Do not pass untrusted input as key names in `options.imports`. Only use developer-controlled, static key names.