<A HREF="http://www.eweek.com/c/a/Security/Adobe-Ships-Silent-Fix-for-Critical-PDF-Reader-Flaw/?kc=EWKNLNAV020708STR1">Adobe has released a software fix</A> for what's described simply as "security vulnerabilities" in its ubiquitous Adobe Reader program, but has not issued public documentation on the risk severity.

The patch, included in Adobe Reader 8.1.2, plugs at least one known critical issue that allows rigged PDF files to be used in code execution attacks, says Kostya Kortchinsky, a vulnerability researcher at Immunity.