The bdfReadCharacters function in bitmap/bdfread.c in X.Org libXfont
before 1.4.9 and 1.5.x before 1.5.1 does not properly handle character
bitmaps it cannot read, which allows remote authenticated users to
cause a denial of service (NULL pointer dereference and crash) and
possibly execute arbitrary code via a crafted BDF font file.
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