Justin Rye noticed that polygen generates precompiled grammar objects world-writable, which can be exploited by a local attacker to at least fill up the filesystem.
The old stable distribution (woody) does not contain the polygen package.
For the stable distribution (sarge) this problem has been fixed in version 1.0.6-7sarge1.
For the unstable distribution (sid) this problem has been fixed in version 1.0.6-9.
We recommend that you upgrade your polygen package.