A new patch came out yesterday for MSMQ:
If you are already on the latest service pack then you will be OK for Windows XP and Windows Vista; Windows Server 2008 (R1 and R2) and Windows 7 are also unaffected.
The full list of operating systems at risk is:
- Windows 2000
- Windows 2003
- Windows Vista (without service packs)
- Windows XP (without service pack 3)