A vulnerability has been discovered and corrected in pango: Array index error in the hb_ot_layout_build_glyph_classes function in pango/opentype/hb-ot-layout.cc in Pango before 1.27.1 allows context-dependent attackers to cause a denial of service via a crafted font file, related to building a synthetic Glyph Definition table by using this font"s charmap and the Unicode property database . Packages for 2008.0 and 2009.0 are provided as of the Extended Maintenance Program