Debian Security Advisory

DLA-684-1 libx11 -- LTS security update

Date Reported:
26 Oct 2016
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 840439.
In Mitre's CVE dictionary: CVE-2016-7942, CVE-2016-7943.
More information:

Tobias Stoeckmann from the OpenBSD project discovered the following vulnerability in libX11, the X11 client-side library:

Insufficient validation of data from the X server can cause out of boundary memory read (XGetImage()) or write (XListFonts()).

For Debian 7 Wheezy, these problems have been fixed in version 2:1.5.0-1+deb7u3.

We recommend that you upgrade your libx11 packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: