A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.
CVE-2026-0966
CVSS base score
8.2 (v3.1)
Severity
HIGH
Attack vector
Network
Weakness
CWE-124
Last modified
November 5, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected products
libssh libssh
redhat hardened images
redhat openshift container platform
redhat enterprise linux
References
- access.redhat.com
- access.redhat.com
- access.redhat.com Vendor Advisory
- access.redhat.com Mitigation, Vendor Advisory
- bugzilla.redhat.com Issue Tracking, Vendor Advisory
- www.libssh.org Release Notes