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Vulnerability record · CVE-2026-0966 · published 26 March 2026

CVE-2026-0966: Libssh vulnerability

Libssh · Libssh

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.

8.2 CVSS 3.1 High EPSS 0.58% · top 54.4% CWE-124 · CWE-124
8.2CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
1 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:18160
https://access.redhat.com/errata/RHSA-2026:18683
https://access.redhat.com/errata/RHSA-2026:7067 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-0966 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2433121 Issue TrackingVendor Advisory
https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ Release Notes

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Source: NIST National Vulnerability Database (record CVE-2026-0966), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.