Counter-Strike: Source Update Released
Product Update - Valve
Updates to Counter-Strike: Source have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Counter-Strike: Source
Fixed several problems with missing textures in community maps.
Fixed a crash that could occur when stats get updated.
Fixed a crash that could occur when displaying the scoreboard.
Added "cl_show_achievement_popups", a convar that is on by default. Turning it off disables in-game achievement announcements.
Restricted the range of commands that servers can cause clients to execute when closing the MOTD.
Server admins will need to change the "cmd" key from a string to one of the following ints:
0 for no command
1 for joingame
2 for changeteam
3 for impulse 101
4 for mapinfo
5 for closed_htmlpage
6 for chooseteam

Engine
Fixed an exploit that allowed a plug-in to be loaded as a .dll file on the client after being downloaded from the server.
Missed from last update:
Removed an exploit that allowed players to change their in-game name outside of the Steam Community

Linux Dedicated Server
Fixed srcds_run so -autoupdate works properly for Counter-Strike: Source