Intermittent Bug In serializeJSON() In Adobe ColdFusion 2025

This article describes an intermittent bug encountered in Adobe ColdFusion 2025's serializeJson() function, which throws an 'Invalid argument value' error on rare occasions (5-6 times per day). The author, after debugging, found that adding a sleep(100) and retrying the identical call resolves the issue without the second attempt failing. The bug appears to be a timing-related issue introduced in a recent ColdFusion update, possibly related to a security fix. The article includes code examples and logging evidence showing only the first attempt fails, suggesting a transient bug in the function itself rather than user code.