CVE-2026-49337 libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes decodercontext::readsliceNAL libde265/decctx.cc:481 to attach slice headers to a finished picture object that has no active image unit, resulting in...