The Dumper method in Data::Dumper before 2.154, as used in Perl 5.20.1 and earlier, allows context-dependent attackers to cause a denial of service (stack consumption and crash) via an Array-Reference with many nested Array-References, which triggers a large number of recursive calls to the DD_dump function.
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seclists.org/fulldisclosure/2014/Sep/84
seclists.org/oss-sec/2014/q3/692
secunia.com/advisories/61441
secunia.com/advisories/61961
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exchange.xforce.ibmcloud.com/vulnerabilities/96216
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
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www.lsexperts.de/advisories/lse-2014-06-10.txt