IrfanView before 4.27 does not properly handle an unspecified integer variable during processing of PSD images, which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted image file that triggers a heap-based buffer overflow, related to a "sign-extension error."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6705
https://exchange.xforce.ibmcloud.com/vulnerabilities/58548
http://www.securityfocus.com/bid/40104
http://www.securityfocus.com/archive/1/511274/100/0/threaded
http://secunia.com/secunia_research/2010-41