The binary delta decoder in Mercurial before 3.7.3 allows remote attackers to execute arbitrary code via a (1) clone, (2) push, or (3) pull command, related to (a) a list sizing rounding error and (b) short records.
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_3.7.3_.282016-3-29.29
https://selenic.com/repo/hg-stable/rev/b9714d958e89
https://selenic.com/repo/hg-stable/rev/b6ed2505d6cf
https://security.gentoo.org/glsa/201612-19
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.debian.org/security/2016/dsa-3542
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00043.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00018.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00016.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181542.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181505.html