• CVE-2015-8359: DLL Preloading vulnerability on Windows
  The version of Qt bundled with KeePassX 0.4.3 is vulnerable to a DDL preloading attack.
  This vulnerability only affects KeePassX on Windows.
  If successfully exploited, arbitrary code can be executed in the context of KeePassX.
  KeePassX 0.4.4 ships with Qt 4.8.7 and employs additional hardening measures.
  Thanks to Trenton Ivey from SecureWorks for reporting this vulnerability to us.
• CVE-2015-8378: Canceling XML export function creates export as “.xml” file
  When canceling the “Export to > KeePassX XML file” function the cleartext passwords were still exported.
  In this case the password database was exported as the file “.xml” in the current working directory (often $HOME or the directory of the database).
  Originally reported as Debian bug #791858

KeePassX 0.4.4 fixes both vulnerabilities.
It is available as a source tarball and Windows / Mac OS X binaries: Download
The OS X bundle contains only a 64bit binary (compared to 0.4.3 which shipped as i386 and powerpc).
The fix for CVE-2015-8378 is also available as a patch: CVE-2015-8378.patch

We will still provide security support for the 0.4 series for some time but please consider updating to version 2.0 instead.