Integer overflow in the gst_vorbis_tag_add_coverart function (gst-libs/gst/tag/gstvorbistag.c) in vorbistag in gst-plugins-base (aka gstreamer-plugins-base) before 0.10.23 in GStreamer allows context-dependent attackers to execute arbitrary code via a crafted COVERART tag that is converted from a base64 representation, which triggers a heap-based buffer overflow.