On bugtraq, there was an announcement concerning Safe.pm 2.0.7 and earlier with Perl 5.8.0 and earlier. From the email: 
1. Problem Description

    Safe.pm 2.0.7 and earlier, when used in Perl 5.8.0 and
    earlier, may allow attackers to break out of safe compartments
    in (1) Safe::reval or (2) Safe::rdo using a redefined @_
    variable, which is not reset between successive calls. 
    
    The Common Vulnerabilities and Exposures project (cve.mitre.org)
    has assigned the name CAN-2002-1323 to this issue.

[download]

Refer to http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1323 for more info.

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In reply to Some versions of Safe considered unSafe by dragonchild

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