An update has been released for Left 4 Dead. - Fixed a potential remote code execution exploit. Reported via HackerOne.

An update has been released for Left 4 Dead 2. - Fixed a spectate command exploit that caused servers to hang. - Fixed lobby chat messages not appearing on Linux.

An update has been released for Left 4 Dead. - Dev command 'director_log_scavenge_items' can only be executed by the server. Reported via HackerOne.

An update has been released for Left 4 Dead 2 - Fixed potential buffer overflow in closed captions. Reported via HackerOne. - Dev command 'director_log_scavenge_items' can only be executed by the server. Reported via HackerOne. - Protect against invalid map displacement data. - Fixed official servers allowing clients to load custom content in competitive modes.

An update has been released for Left 4 Dead - Fixed a potential buffer overflow in closed captions. Reported via HackerOne.

An update has been released for Left 4 Dead. - Fixed potential remote code execution exploits. Reported via HackerOne.

An update has been released for Left 4 Dead 2. - Fixed some potential remote code execution exploits. Reported via HackerOne. - Updates to caption localization.

An update has been released for Left 4 Dead 2. - Fixed a potential remote code execution exploit. Reported via HackerOne.

An update has been released for Left 4 Dead. - Fixed a potential remote code execution exploit. Reported via HackerOne.

An update has been released for Left 4 Dead 2. - Security and exploit fixes. Reported in part by Justin G. (sigsegv) and Linus S. (PistonMiner).