"infamous41md" and Chris Evans discovered several heap based buffer overflows in xpdf which are also present in CUPS, the Common UNIX Printing System, and which can lead to a denial of service by crashing the application or possibly to the execution of arbitrary code.
For the old stable distribution (woody) these problems have been fixed in version 1.1.14-5woody14.
CUPS doesn't use the xpdf source anymore since 1.1.22-7, when it switched to using xpdf-utils for PDF processing.
We recommend that you upgrade your CUPS packages.
MD5 checksums of the listed files are available in the original advisory.