The remote host is missing an update to libpng announced via advisory MDVSA-2009:051.
To upgrade automatically use MandrakeUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. https://secure1.securityspace.com/smysecure/catid.html?in=MDVSA-2009:051
A number of vulnerabilities have been found and corrected in libpng: Fixed 1-byte buffer overflow in pngpread.c (CVE-2008-3964). This was allready fixed in Mandriva Linux 2009.0. Fix the function png_check_keyword() that allowed setting arbitrary bytes in the process memory to 0 (CVE-2008-5907). Fix a potential DoS (Denial of Service) or to potentially compromise an application using the library (CVE-2009-0040). The updated packages have been patched to prevent this. Affected: 2008.0, 2008.1, 2009.0, Corporate 3.0, Corporate 4.0, Multi Network Firewall 2.0