STEAMYDATA

Left 4 Dead 2 — patch notes and updates

Stored observation / content update:

Dated developer announcements recorded from Steam. Open the source for the complete update.

UpdateDateExcerpt / source
Left 4 Dead 2 - Update2025-02-05An update has been released for Left 4 Dead 2. - Fixed a compatibility issue that was causing a crash on Linux clients.
Left 4 Dead 2 - Update2025-01-17An update has been released for Left 4 Dead 2. - Fixed exploits used to crash remote servers.
Left 4 Dead 2 - Update2024-12-02An update has been released for Left 4 Dead 2. - Fixed some exploits used to crash remote servers.
Left 4 Dead 2 Free Weekend2024-11-14Left 4 Dead 2 celebrates its 15th anniversary this weekend by going free-to-play until November 18th. Jump in for the first time to battle zombie hordes with your friends, or come back for the opportunity to finally earn the "Good Guy Nick" achievement!
Left 4 Dead 2 - Update2024-10-24An update has been released for Left 4 Dead 2. - Fixed several crash and remote code execution exploits. - Fixed a crash on some NVIDIA graphics cards when shader detail is set to High.
Left 4 Dead 2 - Update2024-07-26An update has been released for Left 4 Dead 2. - Player connect message is no longer networked to clients, to prevent exposing player IP addresses.
Left 4 Dead 2 - Update2024-06-26An update has been released for Left 4 Dead 2: - Fixed a regression that blocked taking screenshots.
Left 4 Dead 2 - Update2024-06-25An update has been released for Left 4 Dead 2: - Fixed a memory leak exploit in lobby chat. - Prevent running arbitrary script code on a remote server. - Prevent a network exploit that gave the client access to server settings. - Implementation example for a new beta feature in Steam.
Left 4 Dead 2 - Update2024-06-04An update has been released for Left 4 Dead 2: - Fixed an exploit that could block a player from connecting to any game, whether online or local. - Fixed two exploits that used invalid content to crash the game or prevent it from loading. - Fixed a memory leak when rejecting invalid content.
Left 4 Dead 2 - Update2024-05-26An update has been released for Left 4 Dead 2: - Fixed a bug that prevented the community server list from appearing.
Left 4 Dead 2 - Update2024-05-14An update has been released for Left 4 Dead 2: - Fixed two exploits that could remotely crash servers. - Fixed music not playing at the main menu on Linux.
Left 4 Dead 2 - Update2024-04-23An update has been released for Left 4 Dead 2: - Fixed another exploit where malicious network packets could severely degrade server performance. - Fixed a client exploit that could cause long server stalls. - Fixed a potential crash if a Charger failed to return to valid nav for an extended period of time. - Fixed a rare hang from ray traces encountering NaN values.
Left 4 Dead 2 - Update2024-04-12An update has been released for Left 4 Dead 2: - Blocked an exploit that could forcibly disconnect a player from any server, even when playing a local game.
Left 4 Dead 2 - Update2024-03-26An update has been released for Left 4 Dead 2: - Fixed two exploits that could crash remote servers. - Fixed missing lobby state messages. - Fixed community server searches not always returning the full set of lowest-ping results.
Left 4 Dead 2 - Update2024-03-13An update has been released for Left 4 Dead 2: - Improved the reliability of "mm_dedicated_force_official_servers" to find the lowest ping server across the supplied IPs.
Left 4 Dead 2 - Update2024-03-11An update has been released for Left 4 Dead 2: - Fixed several matchmaking lobby exploits. - The cvar "mm_dedicated_force_servers" now only applies to lobbies with the "Best Available Dedicated" server type as originally intended - for all other lobby types the cvar is ignored. Lobby leaders who wish to force official dedicated server selection due to location or network issues should use the new cvar "mm_dedicated_force_official_servers", which only pulls from available official dedicated servers at the requested IPs.
Left 4 Dead 2 - Update2024-02-29An update has been released for Left 4 Dead 2: - Fixed an exploit where reliable network fragments could stall out a server indefinitely. - Re-enabled uploads by default so sprays will work again.
Left 4 Dead 2 - Update2024-02-22An update has been released for Left 4 Dead 2: - Fixed a degenerate case where malformed network packets could delay processing the remainder of the stream, severely impacting server performance.
Left 4 Dead 2 - Update2024-02-21An update has been released for Left 4 Dead 2: - Fixed possible corruption of the unreliable network stream during high network loads. - Increased default command limits to prevent spurious disconnects.
Left 4 Dead 2 - Update2024-02-07An update has been released for Left 4 Dead 2. - Added protections against malformed network packets. - Reduced server-side command limits per client. - Fixed a regression in script handling of regular expressions. - Fixed several vulnerabilities and exploits reported via HackerOne.