libfastjson: integer overflow and out-of-bounds write via a large JSON file

A flaw was found in json-c. In printbufmemappend, certain crafted values can overflow the memory allowing an attacker to write past the memory boundary. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability...

json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file as demonstrated by printbuf_memappend.

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