This issue only exists when curl is built to use the GnuTLS library. curl can be made to use a large variety of TLS libraries and GnuTLS is not the most common choice. OCSP stapling is not a widely used feature on the open web, perhaps partly because so many big name sites do not support it. This bug is **not** considered a *C mistake* (likely to have been avoided had we not been using C). This flaw also affects the curl command line tool.