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A Use After Free vulnerability exists in Artifex Software, Inc. MuPDF library 1.17.0-rc1 and earlier when a valid page was followed by a page with invalid pixmap dimensions, causing bander - a static - to point to previously freed memory instead of a newband_writer. Reference: https://bugs.ghostscript.com/show_bug.cgi?id=702253 Upstream patch: http://git.ghostscript.com/?p=mupdf.git;h=96751b25462f83d6e16a9afaf8980b0c3f979c8b
I have no clue which OS or release this bug is for, but Fedora 32 and up have mupdf 1.18.0, Fedora 31 has mupdf 1.17.0 (all of which contain the fix); only Fedora 30 and below are affected (but EOLed since long).