From the OpenBSD log: The UTF-8 decoder should not accept byte sequences which decode to unicode code positions U+D800 to U+DFFF (UTF-16 surrogates), U+FFFE, and U+FFFF. http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8 http://unicode.org/faq/utf_bom.html#utf8-4 Reported by: Stefan Sperling Obtained from: OpenBSD MFC after: 5 days