Algorithmic complexity vulnerability in the
WEBrick::HTTPUtils.split_header_value function in
WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and
earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9
through r18423 allows context-dependent attackers to cause a denial of
service (CPU consumption) via a crafted HTTP request that is processed
by a backtracking regular expression.
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