sot/source/sdstor/stgstrms.cxx in LibreOffice before 5.4.5.1 and 6.x before 6.0.1.1 uses an incorrect integer data type in the StgSmallStrm class, which allows remote attackers to cause a denial of service (use-after-free with write access) or possibly have unspecified other impact via a crafted document that uses the structured storage ole2 wrapper file format.
access.redhat.com/errata/RHSA-2018:3054
bugs.chromium.org/p/oss-fuzz/issues/detail?id=5747
gerrit.libreoffice.org/#/c/48751/
gerrit.libreoffice.org/#/c/48756/
gerrit.libreoffice.org/#/c/48757/
gerrit.libreoffice.org/#/c/48758/
gerrit.libreoffice.org/gitweb?p=core.git%3Ba=commit%3Bh=fdd41c995d1f719e92c6f083e780226114762f05
lists.debian.org/debian-lts-announce/2018/04/msg00021.html
usn.ubuntu.com/3883-1/
www.debian.org/security/2018/dsa-4178
www.libreoffice.org/about-us/security/advisories/cve-2018-10119/