The png_check_keyword function in pngwutil.c in libpng before 1.0.42,
and 1.2.x before 1.2.34, might allow context-dependent attackers to
set the value of an arbitrary memory location to zero via vectors
involving creation of crafted PNG files with keywords, related to an
implicit cast of the '\0' character constant to a NULL pointer. NOTE:
some sources incorrectly report this as a double free vulnerability.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
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