Mandriva Linux Security Advisory 2009-160 – The BigDecimal library in Ruby 1.8.6 before p369 and 1.8.7 before p173 allows context-dependent attackers to cause a denial of service (application crash) via a string argument that represents a large number, as demonstrated by an attempted conversion to the Float data type. This update corrects the problem.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79699/MDVSA-2009-160.txt
Source: https://packetstormsecurity.com/files/79699/Mandriva-Linux-Security-Advisory-2009-160.html