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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (46.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
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
- Red Hat Enterprise Linux — versions 8.0, 9.0, 10.0
- Red Hat Hardened Images
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:7067 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2026-0966 (Mitigation, vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ (Release Notes)
- access.redhat.com/errata/RHSA-2026:18160 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:18683 (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.