CVE-2016-0739: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 2.4% chance of exploitation in the next 30 days.

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Fedoraproject Fedora: version 22 only; version 23 only
• Libssh Libssh: up to and including 0.7.2
• Red Hat Enterprise Linux: version 7.0 only

Published 2016-04-13. Last modified 2026-06-17.