All Bash 3.1 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/bash-3.1_p18-r1"

All Bash 3.2 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/bash-3.2_p52-r1"

All Bash 4.0 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/bash-4.0_p39-r1"

All Bash 4.1 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/bash-4.1_p12-r1"

All Bash 4.2 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p48-r1"