OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.
A buffer overflow in the BMP reader in OptiPNG has been reported.
A remote attacker could entice a user to process a specially crafted BMP image, possibly resulting in the execution of arbitrary code with the privileges of the user running the application, or a Denial of Service.
There is no known workaround at this time.
All OptiPNG users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=media-gfx/optipng-0.6.2"