CVE-2016-4008: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 29.4% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Fedoraproject Fedora: version 22 only; version 23 only; version 24 only
• GNU LIBTASN1: up to and including 4.7
• Opensuse Opensuse: version 13.2 only

Published 2016-05-05. Last modified 2026-06-17.