Buffer overflow in IrfanView before 4.37, when a multibyte-character directory name is used, allows user-assisted remote attackers to execute arbitrary code via a crafted file that is incorrectly handled by the Thumbnail tooltips feature in the Thumbnails window.

Integer overflow in IrfanView 4.23, when the resampling or screen fitting option is enabled, allows remote attackers to execute arbitrary code via a crafted TIFF 1 BPP image, which triggers a heap-based buffer overflow.

Heap-based buffer overflow in IrfanView before 4.27 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted PSD image with RLE compression.

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."