Hi,
Since Nick stepped down as libxslt maintainer (thank you for maintaining libxslt for so long, Nick!), two security issues have been reported in libxslt, with disclosure deadlines of July 9 and July 13, respectively. If anybody is interested in helping to maintain libxslt, this project is really in need of a new maintainer.
If you just want to help fix the issues without becoming a maintainer, GNOME developers can find the details here and here. I wouldn’t be surprised if more such issues are reported soon.