The gnutls_ocsp_resp_check_crt function in lib/x509/ocsp.c in GnuTLS before 3.4.15 and 3.5.x before 3.5.4 does not verify the serial length of an OCSP response, which might allow remote attackers to bypass an intended certificate validation mechanism via vectors involving trailing bytes left by gnutls_malloc.
lists.opensuse.org/opensuse-security-announce/2017-02/msg00005.html
www.securityfocus.com/bid/92893
access.redhat.com/errata/RHSA-2017:2292
gitlab.com/gnutls/gnutls/commit/964632f37dfdfb914ebc5e49db4fa29af35b1de9
lists.gnupg.org/pipermail/gnutls-devel/2016-September/008146.html
www.gnutls.org/security.html