Multiple off-by-one errors in libpng before 1.2.32beta01, and 1.4
before 1.4.0beta34, allow context-dependent attackers to cause a
denial of service (crash) or have unspecified other impact via a PNG
image with crafted zTXt chunks, related to (1) the png_push_read_zTXt
function in pngread.c, and possibly related to (2) pngtest.c.
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