This update for libxml2 fixes the following issues: - CVE-2017-9047, CVE-2017-9048: The function xmlSnprintfElementContent in valid.c was vulnerable to a stack buffer overflow - CVE-2017-9049: The function xmlDictComputeFastKey in dict.c was vulnerable to a heap-based buffer over-read. - CVE-2017-9050: The function xmlDictAddString was vulnerable to a heap-based buffer over-read - CVE-2016-1839: heap-based buffer overflow