In Go applications, parsing untrusted data creates a dangerous attack surface that’s routinely exploited in the wild. During our security assessments, we’ve repeatedly exploited unexpected behaviors in Go’s JSON, XML, and YAML parsers to bypass authentication, circumvent authorization controls, and exfiltrate sensitive data from production systems.These aren’t theoretical issues—they’ve led to documented vulnerabilities like CVE-2020-16250 (a Hashicorp Vault authentication bypass found by Google...