Public bug reported:

Ubuntu 16.04 packages libxml2 version 2.9.3*, which contains a
regression documented here:
https://git.gnome.org/browse/libxml2/commit/?id=4f8606c13cb7f2684839f850b83de5ce647d3ca7

Full release notes of 2.9.4 can be seen here:
http://xmlsoft.org/news.html

The bug will affect XML push parser that fails with bogus UTF-8 encoding
error when multi-byte character in large CDATA section is split across
buffer, which can be quite common.

As Xenial is an LTS version and this bug is quite *critical*, I wonder
if we should provide an update to fix this one. If I remember correctly,
we're not supposed to update to a newer version a given package for a
given version of Ubuntu, but as this version of Ubuntu will be used in
many servers in the coming years and XML parsing is quite a common task,
it may help a lot of developers to have a backported fix of this issue.

Let me know you if you need more information.

** Affects: libxml2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1652325

Title:
  Libxml2 2.9.3 fails to parse multi-byte character in large CDATA
  section that is split across buffer

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