CVE-2026-0966

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.

What this means for your business

It affects Libssh. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 45% of all known flaws.

What to do

1Check whether your company or your suppliers run Libssh, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 8.2 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness: CWE-124
Assigned by: secalert@redhat.com

Dates

Published: 2026-03-26
Last modified: 2026-09-01
Sources: NVD

Affected products

Libssh Libssh- 0.11.4
Redhat Hardened Imagesall versions
Redhat Openshift Container Platform4.0
Redhat Enterprise Linux8.0, 9.0, 10.0

As listed in the NVD configuration data. Not a statement about your estate.