CVE-2011-5036: Hash Collision Form Parameter Parsing Remote DoS

December 29, 2011 (updated October 30, 2013)

This package contains a flaw that may allow a remote denial of service. The issue is triggered when an attacker sends multiple crafted parameters which trigger hash collisions, and will result in loss of availability for the program via CPU consumption.

References

osvdb.org/show/osvdb/78121
github.com/rack/rack/commit/09c5e53f11a491c25bef873ed146842f3cd03228

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