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CVE-2026-0966

Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

Published: 3/26/2026 Last updated: 5/19/2026 Reserved: 1/14/2026

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.

CNA assigner: redhat (53f830b8-0a3f-465b-8143-3b8a9948e749) Requested by: n/a

Metrics

Version Score Severity Vector String
3.0 6.5 Medium CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Opam packages affected (1)

libssh

Products affected (13)

Product Vendor Version
Red Hat Enterprise Linux 10 Red Hat n/a
Red Hat Enterprise Linux 9 Red Hat n/a
Red Hat Enterprise Linux 9 Red Hat R2.1 and prior
Red Hat Enterprise Linux 10 Red Hat Windows 10 Version 1607 for 32-bit Systems
Red Hat Enterprise Linux 9 Red Hat Windows 10 Version 1607 for x64-based Systems
Red Hat Enterprise Linux 9 Red Hat Windows 10 Version 1703 for 32-bit Systems
Red Hat Enterprise Linux 8 Red Hat Windows 10 Version 1803 for 32-bit Systems
Red Hat Enterprise Linux 6 Red Hat Windows 10 Version 1709 for 32-bit Systems
Red Hat Enterprise Linux 6 Red Hat n/a
Red Hat Enterprise Linux 7 Red Hat Windows 10 Version 1709 for x64-based Systems
Red Hat Hardened Images Red Hat Windows 10 Version 1803 for x64-based Systems
Red Hat Hardened Images Red Hat Windows 10 Version 1703 for x64-based Systems
Red Hat OpenShift Container Platform 4 Red Hat Windows 10 Version 1809 for 32-bit Systems

References (12)

Credits (2)