CVE-2019-3856: Debian Linux

High severity, CVSS 8.8. EPSS: 6.1% chance of exploitation in the next 30 days.

An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Fedoraproject Fedora: version 28 only
• LIBSSH2 LIBSSH2: before 1.8.1 (fixed in 1.8.1)
• Netapp Ontap Select Deploy Administration Utility: affected versions not specified
• Opensuse Leap: version 15.0 only; version 42.3 only
• Oracle PeopleSoft Enterprise PeopleTools: version 8.56 only; version 8.57 only
• Red Hat Enterprise Linux: version 8.0 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.6 only
• Red Hat Enterprise Linux Server Eus: version 7.6 only
• Red Hat Enterprise Linux Server Tus: version 7.6 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2019-03-25. Last modified 2026-06-17.