Vulnerability in Libssh
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.
EPSS: 0.006 (45.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
- Libssh
- Red Hat Enterprise Linux 10 — versions 0:0.12.0-2.el10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:0.10.4-18.el9
- Red Hat Hardened Images — versions 0.12.0-1.1.hum1
- Red Hat Openshift Container Platform 4
- Redhat Enterprise_linux — versions 8.0, 9.0, 10.0
- Redhat Hardened_images
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- secalert@redhat.com (x_refsource_REDHAT, Mitigation, vdb-entry, Vendor Advisory)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
- secalert@redhat.com (Release Notes)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
Frequently asked questions
- What is CVE-2026-0966?
- CVE-2026-0966 is a high-severity vulnerability in Libssh, classified under Buffer Underwrite. CVSS score: 8.2/10. Published 2026-03-26.
- How severe is CVE-2026-0966?
- High severity. CVSS v3 base score is 8.2 out of 10.