libexif is a library for parsing, editing and saving EXIF metadata from images.
iDefense Labs have discovered that the exif_data_load_data_entry() function in libexif/exif-data.c improperly handles integer data while working with an image with many EXIF components, allowing an integer overflow possibly leading to a heap-based buffer overflow.
An attacker could entice a user of an application making use of a vulnerable version of libexif to load a specially crafted image file, possibly resulting in a crash of the application or the execution of arbitrary code with the rights of the user running the application.
There is no known workaround at this time.
All libexif users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/libexif-0.6.16"