CVE-2016-8889 (bitcoin_knots)
In Bitcoin Knots v0.11.0.ljr20150711 through v0.13.0.knots20160814 (fixed in v0.13.1.knots20161027), the debug console stores sensitive information including private keys and the wallet passphrase in its persistent command history.
Source: CVE-2016-8889 (bitcoin_knots)