Gentoo Linux Security Advisory GLSA 200503-12 – Tavis Ormandy of the Gentoo Linux Security Audit Team identified a flaw in the Hashcash utility that an attacker could expose by specifying a malformed reply address. Versions less than 1.16-r1 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/36487/glsa-200503-12.txt
Source: https://packetstormsecurity.com/files/36487/Gentoo-Linux-Security-Advisory-200503-12.html