CVE-2026-53701 Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture partition parser

An out-of-bounds write vulnerability was found in GStreamer's H.266/VVC PPS picture partition parser in gst-plugins-bad. In the multi-slice-in-tile processing of gsth266parserparsepicturepartition gsth266parser.c, the loop iterates without checking that the slice index stays within bounds, writin...