Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-3394BC2B-9DA4-11E9-951E-14DAE9D5A9D2:
SDL_image developers report:
Fixed a number of security issues:
TALOS-2019-0820
TALOS-2019-0821
TALOS-2019-0841
TALOS-2019-0842
TALOS-2019-0843
TALOS-2019-0844
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