"Six vulnerabilities in an open-source image format could allow
intruders to compromise computers running Linux and may allow
attacks against Windows PCs as well as Macs running OS X.
"The security issues appear in a library supporting the portable
network graphics (PNG) format, used widely by programs such as the
Mozilla and Opera browsers and various e-mail clients. The most
critical issue, a memory problem known as a buffer overflow, could
allow specially created PNG graphics to execute a malicious program
when the application loads the image..."