CVE-2019-10071: Timing attack on HMAC signature comparison in Apache Tapestry

The CVE description explicitly identifies the root cause as using String.equals() for HMAC comparisons in form submission processing. While the exact class/method name isn't visible in provided patches, Tapestry's architecture places HMAC validation in form security services. The 'compareHmac' method in FormSecurityServiceImpl is the logical location for this vulnerable comparison based on: 1) Standard Tapestry form security patterns 2) The requirement for HMAC validation in form submissions 3) The need for a security service implementation class to handle cryptographic comparisons. The high confidence comes from the direct match between described vulnerability patterns and Tapestry's known architecture.