Nokogiri affected by libxslt Use of Uninitialized Resource/ Use After Free vulnerability

In xsltCopyText in transform.c in libxslt 1.1.33, a pointer variable
isn’t reset under certain circumstances. If the relevant memory area
happened to be freed and reused in a certain way, a bounds check could
fail and memory outside a buffer could be written to, or uninitialized
data could be disclosed.

Nokogiri prior to version 1.10.5 contains a vulnerable version of
libxslt. Nokogiri version 1.10.5 upgrades the dependency to
libxslt 1.1.34, which contains a patch for this issue.