graphics/jasper is a (the?) alternate JPEG 2000 CODEC project.    It has good support and no currently reported vulns.  It is used by graphics/GraphicsMagick and might be an altnernatative.  graphics/darktable seems to have optional graphics/ImageMagick and  graphics/openjpeg support, so simply unselecting those options should get you past the vulnerability fail.  If you need JPEG200 support, I seem to remember in the distant past doing something like this site describes to use graphics/GraphicsMagick instead of graphics/ImageMagick, which would then optionally install graphics/jasper for JPEG2000 support rather than  graphics/openjpeg.
				
			 
			    