From MFSA 2008-45: Security researcher Billy Hoffman discovered a bug in the XBM decoder that allowed random small chunks of uninitialized memory to be read. The severity of this bug was low and did not appear to cause any memory corruption.
This is now public
This was addressed via: Red Hat Enterprise Linux version 2.1 (RHSA-2008:0882) Red Hat Enterprise Linux version 3 (RHSA-2008:0882) Red Hat Enterprise Linux version 4 (RHSA-2008:0882)