Log Message:
xmlSnprintfElementContent failed to correctly check the available
buffer space in two locations.
Fixes bug 781333 (CVE-2017-9047) and bug 781701 (CVE-2017-9048).
From: \ 
https://git.gnome.org/browse/libxml2/commit/?id=932cc9896ab41475d4aa429c27d9afd175959d74

There were two bugs where parameter-entity references could lead to an
unexpected change of the input buffer in xmlParseNameComplex and
xmlDictLookup being called with an invalid pointer.

Percent sign in DTD Names
=========================
This fixes bug 766956 initially reported by Wei Lei and independently by
Chromium's ClusterFuzz, Hanno Böck, and Marco Grassi. Thanks to everyone
involved.

xmlParseNameComplex with XML_PARSE_OLD10
========================================
This fixes bugs 781205 (CVE-2017-9049) and 781361 (CVE-2017-9050).
Thanks to Marcel Böhme and Thuan Pham for the report.

Additional hardening
====================
A separate check was added in xmlParseNameComplex to validate the
buffer size.

From: \ 
https://git.gnome.org/browse/libxml2/commit/?id=e26630548e7d138d2c560844c43820b6767251e3