Debian: DSA-4407-1 Critical Vulnerability in XMLTooling Denial of Service

Ross Geerlings discovered that the XMLTooling library didn't correctly
handle exceptions on malformed XML declarations, which could result in
denial of service against the application using XMLTooling.

For the stable distribution (stretch), this problem has been fixed in
version 1.6.0-4+deb9u2.

We recommend that you upgrade your xmltooling packages.

For the detailed security status of xmltooling please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/xmltooling

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/