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A bug in OpenSSL, used by Bitcoin-Qt/Bitcoin Core, could allow your bitcoins to be stolen. Immediately updating Bitcoin Core to 0.9.1 is required in some cases, especially if you’re using 0.9.0
https://bitcoin.org/bin/0.9.1/

Win32 builds were rebuilt using patched openssl library. Zipballs are available to download on sourceforge:

0.4.4.6:
http://sourceforge.net/projects/novacoin/files/novacoin-nosetup-0.4.4.6-update3-win32-openssl-1.0.1g.zip/download
http://sourceforge.net/projects/novacoin/files/novacoin-nosetup-0.4.4.6-update3-win32-amd64-openssl-1.0.1g.zip/download

0.4.4.7:
http://sourceforge.net/projects/novacoin/files/novacoin-nosetup-0.4.4.7-bugfix4-win32-openssl-1.0.1g.zip/download
http://sourceforge.net/projects/novacoin/files/novacoin-nosetup-0.4.4.7-bugfix4-win32-amd64-openssl-1.0.1g.zip/download

Installers will be available a bit later. It’s recommended to apply this update.

If you ever used -rpcssl setting for RPC server or RPC client, then you have to consider your wallet as compromised. You need to create new wallet in this case, and then send all your coins to new addresses. If you didn’t used the -rpcssl option, then you don’t have to worry about this issue.