A new version of GnuPG has been released addressing memory allocation problems.

From the ChangeLog:

 *    Fixed 2 more possible memory allocation attacks.  They are
      similar to the problem we fixed with 1.4.4.  This bug can easily
      be be exploted for a DoS; remote code execution is not entirely
      impossible.

At the time of writing this version was still trickling down to mirrors.