OCaml Xml-Light Library before r234 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via unspecified vectors.
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0266
http://www.securityfocus.com/bid/55114
http://www.openwall.com/lists/oss-security/2012/08/21/2
http://www.mandriva.com/security/advisories?name=MDVSA-2013:107