--- a/src/OpenSSL/crypto.py	2016-10-15 18:26:14.000000000 +0530
 +++ b/src/OpenSSL/crypto.py	2018-06-14 06:48:09.056973800 +0530
 @@ -1567,6 +1567,8 @@
      def _init(self):
          """
          Set up the store context for a subsequent verification operation.
 +        Calling this method more than once without first calling
 +        :meth:`_cleanup` will leak memory.
          """
          ret = _lib.X509_STORE_CTX_init(
              self._store_ctx, self._store._store, self._cert._x509, _ffi.NULL
 @@ -1627,6 +1629,9 @@
          """
          # Always re-initialize the store context in case
          # :meth:`verify_certificate` is called multiple times.
 +        # :meth:`_init` is called in :meth:`__init__` so _cleanup is called
 +        # before _init to ensure memory is not leaked.
 +        self._cleanup()
          self._init()
          ret = _lib.X509_verify_cert(self._store_ctx)
          self._cleanup()