How a Single Unicode Character Crashed a Payment Gateway
from The Software Engineering Podcast with Fexingo: Code, Architecture, and Engineering Best Practices Hosted by Fexingo
In this episode of The Software Engineering Podcast, Lucas and Luna dive into a bizarre production outage caused by a single Unicode character. They dissect how a zero-width space sneaked into a payment gateway's input validation, bypassing all regex checks and causing silent transaction failures. Lucas breaks down the technical specifics—how UTF-8 encoding works, why most sanitizers miss non-printable characters, and the exact fix the team deployed. Luna adds context with her own experience of a similar invisible-character bug in a chat application. Together, they explore practical prevention strategies: normalizing input with Unicode Normalization Form KC, using whitelist-based validation, and incorporating fuzz testing with special characters. The episode concludes with a reflection on how the smallest edge cases can bring down production systems. Perfect for backend engineers, DevOps professionals, and anyone dealing with text processing. #Unicode #ZeroWidthSpace #PaymentGateway #ProductionOutage #InputValidation #UTF8 #SoftwareEngineering #Debugging #EdgeCase #Normalization #FuzzTesting #Backend #Security #Encoding #TechPodcast #FexingoBusiness #BusinessPodcast #Technology Keep every episode free: buymeacoffee.com/fexingo
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