The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1_DECODE_FLAG_STRICT_DER flag, allows remote attackers to cause a denial of service (infinite recursion) via a crafted certificate.
https://security.gentoo.org/glsa/201703-05
https://lists.gnu.org/archive/html/help-libtasn1/2016-04/msg00009.html
http://www.ubuntu.com/usn/USN-2957-2
http://www.ubuntu.com/usn/USN-2957-1
http://www.openwall.com/lists/oss-security/2016/04/11/3
http://www.debian.org/security/2016/dsa-3568
http://lists.opensuse.org/opensuse-updates/2016-06/msg00097.html
http://lists.opensuse.org/opensuse-updates/2016-06/msg00047.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183221.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182907.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182299.html