The vulnerability stems from improper certificate validation in the jruby-openssl gem. The advisory explicitly states that failed verification 'silently did nothing,' which points to critical SSL handshake and validation functions.

1. SSLSocket#connect: This method is responsible for establishing the SSL connection. In proper implementations, it should check verification results and raise errors on failure. The vulnerability suggests this check was missing or bypassed.

2. SSLContext#set_verify: This method configures verification settings. The lack of validation implies it failed to bridge Ruby's VERIFY_PEER flag to Java's TrustManager configuration, leaving validation unenforced.

While the exact pre-0.6 code is unavailable, these functions are central to SSL validation in Ruby/OpenSSL integrations. The high confidence for SSLSocket#connect aligns with its direct role in connection establishment, while set_verify has medium confidence due to the indirect linkage to Java's SSL stack.