Обновите, пожалуйста, пакет из сизифа. Там с версии 1.4.1, которая сейчас лежит в 5.1 и p5, было много изменений: и критических и по DNSSEC.
unbound-1.4.12-alt0.M51.1 -> 5.1: * Sat Sep 17 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.12-alt0.M51.1 - Backport to M51 (ALT #26308) * Fri Jul 22 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.12-alt1 - 1.4.12 * Sun Jul 03 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.11-alt1 - 1.4.11 * Wed Jun 01 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.10-alt1 - 1.4.10 - Fix assertion failure when unbound generates an empty error reply in response to a query, CVE-2011-1922 VU#531342 * Sat Apr 16 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.9-alt1 - 1.4.9 * Mon Feb 07 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.8-alt4 - Rebuild with new libevent - Fix init script - Make devel subpackage noarch * Thu Feb 03 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.8-alt3 - Use libevent1.4 - Fix init script * Thu Feb 03 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.8-alt2 - Fix init script * Thu Feb 03 2011 Slava Dubrovskiy <dubrsl@altlinux> 1.4.8-alt1 - 1.4.8 - Build with libevent - Update init for run unbound-anchor - Enable by default auto-trust-anchor-file for DNSSEC * Sat Nov 13 2010 Slava Dubrovskiy <dubrsl@altlinux> 1.4.7-alt1 - 1.4.7 * Fri Aug 27 2010 Slava Dubrovskiy <dubrsl@altlinux> 1.4.6-alt1 - 1.4.6 - Add make test and update BuildRequires * Tue Jun 22 2010 Slava Dubrovskiy <dubrsl@altlinux> 1.4.5-alt1 - 1.4.5 * Fri May 14 2010 Slava Dubrovskiy <dubrsl@altlinux> 1.4.4-alt1 - 1.4.4 * Sun Apr 04 2010 Slava Dubrovskiy <dubrsl@altlinux> 1.4.3-alt1 - 1.4.3