A problem has been discovered in mah-jong, a variant of the original Mah-Jong game, that can be utilised to crash the game server after dereferencing a NULL pointer. This bug be exploited by any client that connects to the mah-jong server.
For the stable distribution (woody) this problem has been fixed in version 1.4-3.
For the unstable distribution (sid) this problem has been fixed in version 1.6.2-1.
We recommend that you upgrade your mah-jong package.