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raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maximum nspace declarations for the XML writer, leading to heap-based buffer overflows (sometimes seen in raptor_qname_format_as_xml). For more details, see the oss-security discussion: https://www.openwall.com/lists/oss-security/2020/11/13/1 Signed-off-by: Peter Korsgaard <peter@korsgaard.com>