Not much to say, details can be found here: https://kb.isc.org/article/AA-01015 Reproducible: Always 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...
Please * 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 ***