From the Crypt::CBC Changes file (emphasis added): 

2.17    Mon Jan  9 18:22:51 EST 2006
        -IMPORTANT NOTE: Versions of this module prior to 2.17 were incorrectly
        using 8 byte IVs when generating the old-style RandomIV style header
        (as opposed to the new-style random salt header). This affects data
        encrypted using the Rijndael algorithm, which has a 16 byte blocksize,
        and is a significant security issue.

        The bug has been corrected in versions 2.17 and higher by making it
        impossible to use 16-byte block ciphers with RandomIV headers. You may
        still read legacy encrypted data by explicitly passing the 
        -insecure_legacy_decrypt option to Crypt::CBC->new().

In reply to Re: Crypt::CBC, Blowfish and Salt problem by almut
in thread Crypt::CBC, Blowfish and Salt problem by Anonymous Monk

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