Gentoo has issued an update for gallery. This fixes a weakness and some vulnerabilities, where some have unspecified impacts and others can be exploited by malicious users or malicious people to disclose sensitive information, conduct cross-site scripting attacks, bypass certain security restrictions, and potentially compromise a vulnerable system.

For more information:
SA28163

Solution
Update to "www-apps/gallery-2.2.4" or later.
Original Advisory
http://www.gentoo.org/security/en/glsa/glsa-200802-04.xml

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers