The (1) psp (aka .tub), (2) bmp, (3) pcx, and (4) psd plugins in gimp allow user-assisted remote attackers to cause a denial of service (crash or memory consumption) via crafted image files, as discovered using the fusil fuzzing tool.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10099
http://www.securityfocus.com/bid/25424
http://www.redhat.com/support/errata/RHSA-2007-0513.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:170
http://secunia.com/advisories/26939