Integer overflow in the queue_init function in unsquashfs.c in unsquashfs in Squashfs 4.2 and earlier allows remote attackers to execute arbitrary code via a crafted block_log field in the superblock of a .sqsh file, leading to a heap-based buffer overflow.
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0001
https://security.gentoo.org/glsa/201612-40
http://www.securityfocus.com/bid/54610
http://www.openwall.com/lists/oss-security/2012/07/19/6
http://www.mandriva.com/security/advisories?name=MDVSA-2013:128