Description
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.
CVSS breakdown
CVSS 3.0
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected products
- libssh / libssh0.11.4
- RedHat / enterprise_linux8.0 – 8.0
- RedHat / enterprise_linux9.0 – 9.0
- RedHat / enterprise_linux10.0 – 10.0
- RedHat / hardened_images
- RedHat / openshift_container_platform4.0 – 4.0
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:18160
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:18683
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:7067
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-0966
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2433121
- MISChttps://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/
Updated 17m ago · 8 sources