Multiple vulnerabilities was discovered and corrected in postgresql:

An authenticated database user can manipulate modules and tied
variables in some external procedural languages to execute code with
enhanced privileges (CVE-2010-3433).

Packages for 2008.0 and 2009.0 are provided as of the Extended
Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

This update provides a solution to these vulnerabilities.