The HWP filter in LibreOffice before 4.3.7 and 4.4.x before 4.4.2 and Apache OpenOffice before 4.1.2 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted HWP document, which triggers an out-of-bounds write.
https://www.libreoffice.org/about-us/security/advisories/cve-2015-1774/
https://security.gentoo.org/glsa/201603-05
http://www.ubuntu.com/usn/USN-2578-1
http://www.securitytracker.com/id/1032206
http://www.securitytracker.com/id/1032205
http://www.securityfocus.com/bid/74338
http://www.openoffice.org/security/cves/CVE-2015-1774.html
http://www.debian.org/security/2015/dsa-3236
http://rhn.redhat.com/errata/RHSA-2015-1458.html
http://lists.opensuse.org/opensuse-updates/2015-05/msg00015.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157550.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156582.html