engine's internal mapping of string values contained an error in
cases where the number of values being stored was above 64K.
In such cases an offset pointer was manually moved forwards and
backwards to access the larger address space.
If an exception was thrown between the time that the offset pointer
was moved forward and the time it was reset, then the exception
object would be read from an invalid memory address, potentially
executing attacker-controlled memory.
This is now public:
This issue has been addressed in following products:
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Via RHSA-2011:0310 https://rhn.redhat.com/errata/RHSA-2011-0310.html