There is a problem calling GnuPG from a CGI. It is related to using open2/open3 (which your library probably uses).

There is some info here, I hope it helps.

In reply to Re: GnuPG tie to gpg binary gives broken pipe error in CGI output by fglock
in thread GnuPG tie to gpg binary gives broken pipe error in CGI output by mattr

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