Gentoo Linux Security Advisory GLSA 200701-01 – Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that DenyHosts used an incomplete regular expression to parse failed login attempts. Versions less than 2.6 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/53398/glsa-200701-01.txt
Source: https://packetstormsecurity.com/files/53398/Gentoo-Linux-Security-Advisory-200701-1.html