It was discovered that libxslt, an XSLT processing runtime library, could be coerced into executing arbitrary code via a buffer overflow when an XSL style sheet file with a long XSLT "transformation match" condition triggered a large number of steps.
For the stable distribution (etch), this problem has been fixed in version 1.1.19-2.
For the unstable distribution (sid), this problem has been fixed in version 1.1.24-1.
We recommend that you upgrade your libxslt package.
MD5 checksums of the listed files are available in the original advisory.