GHSA-X2Q3-8CJH-766F Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS

Summary extractPart allocates directly from the mscfb directory-entry size with no clamping crypt.go:198, same missing bound at crypt.go:204: go buf := makebyte, entry.Size entry.Size is the raw streamSize field from the attacker-controlled CFB directory entry mscfb v1.0.8 fixFile, file.go:109-12...