A remotely exploitable buffer overflow has been found in OpenSSL

OpenSSL is a commercial-grade, full-featured, and Open Source toolkit which implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

Updates are available for:
Red Hat Linux
Mandrake Linux
Debian GNU/Linux
SuSE