Updated fetchmail packages are now available for Red Hat Linux 5.2, 6.2, 7, and 7.1. These packages close a remotely-exploitable vulnerability in fetchmail.
Fetchmail versions up to 5.8.9 are susceptible to remote attacks from malicious servers. When fetchmail attempts to create an index of messages in the remote mailbox being polled, it uses index numbers sent by the server as an index into an internal array. If a server sends fetchmail a negative number, fetchmail will attempt to write data outside the bounds of the array.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center