Patched, public, vendor advisory is out. This thread is for defenders catching up. Classic integer wrap in a length field before a memcpy into a pool allocation.
Exploitability on modern Windows is messy because of pool encoding, but the crash is easy to hit with a malformed file. Hunt the old immediate. Do not ask for a working exploit.
Refs: CVE Program · MSRC · NVD
Lab / educational. Public binaries and patched classes only. Isolated VM.