Unfortunately an ebuild for PEAR 1.4.x does not seem to be in portage yet. In his blog Greg Beaver says: "After reflection on the serious bugs in PEAR 1.3.x that were fixed in PEAR 1.4.x with unit testing, I came to realize that there is yet another serious security vulnerability in PEAR 1.3.x. I will publish the details shortly.pear.php Don't hesitate, upgrade to PEAR 1.4.6 at your earliest convenience."
*** This bug has been marked as a duplicate of 111525 ***