The uncompress_buffer function in src/server/simple_wml.cpp in Wesnoth before r33069 allows remote attackers to cause a denial of service via a large compressed WML document.

The read_game_map function in src/terrain_translation.cpp in Wesnoth before r32987 allows remote attackers to cause a denial of service (memory consumption and daemon hang) via a map with a large (1) width or (2) height.

The Python AI module in Wesnoth 1.4.x and 1.5 before 1.5.11 allows remote attackers to escape the sandbox and execute arbitrary code by using a whitelisted module that imports an unsafe module, then using a hierarchical module name to access the unsafe module through the whitelisted module.