Derek Noonburg has fixed several potential vulnerabilities in xpdf, which are also present in libextractor, a library to extract arbitrary meta-data from files.
The old stable distribution (woody) does not contain libextractor packages.
For the stable distribution (sarge) these problems have been fixed in version 0.4.2-2sarge3.
For the unstable distribution (sarge) these problems have been fixed in version 0.5.10-1.
We recommend that you upgrade your libextractor package.
MD5 checksums of the listed files are available in the original advisory.