I think I'm also affected by this bug:

When stitching 16 bit (per channel) TIFFs the final panorama sometimes
shows colour artefacts in dark areas.

Blender options in Hugin contain no additional command line options.
Tiffs from NEF using Adobe's Raw Converter (shipped with Photoshop CS6).

According to the documentation --blend-colorspace uses cieluv as a
default. When switching to --blend-colorspace=ciecam (or cielab) the
artefacts don't appear.

Hugin 2018.0.0 built by Niklas Mischkulnig (for Mac OS X)
enblend 4.2.1-f0304648cc0f

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https://bugs.launchpad.net/bugs/1709473

Title:
  Enfuse: artifacts - false colored pixels in dark regions

Status in Enblend:
  New

Bug description:
  enfuse sometimes produces false colored pixels around dark regions
  using the default options.

  When using the option "--blend-colorspace=identity" the artefacts
  don't show (at least with the attached example images).

  Tested with version 4.2  and 4.3-e93b798a0c5f. The artefacts show with
  both versions, although there are differences.

  
  Attached are sample images and the result images after using the included 
script. There is also a self-compiled binary of the enfuse version 
4.3-e93b798a0c5f and a text file ("Info.txt") containing info about versions, 
operating system and hardware. 

  The result images 
  "default.tif" and "default_dev.tif"
  are the images made with default options,
  the images 
  "identity.tif" and "identity_dev.tif"
  are made with the option "--blend-colorspace=identity".

  The images
  "default_dev.tif"and "identity_dev.tif" are made with the development version 
4.3-e93b798a0c5f

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