Not much to say, details can be found here:
Should be fixed in 9.8.5-P2 & 9.9.3-P2, include please in portage ASAP.
Right now all versions we have are vulnerable...
* do search for duplicates before filing a bug
* read the instructions on the category selection page (Security issues go elsewhere, that is EXPLICITLY mentioned there)
*** This bug has been marked as a duplicate of bug 478316 ***