CVE-2026-0966

HIGHNVD 8.26.5▼

8.2

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 v3: 8.2
EG Score: 6.5(medium)
EPSS: 23.9%
KEV: Not listed

Published

March 26, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated Apr 30, 2026

Patch available. Sources: redhat.

generic

libssh 0.12.0 and 0.11.4 security releases – libssh

https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/

redhat

2433121 – (CVE-2026-0966) CVE-2026-0966 libssh: Buffer underflow in ssh_get_hexa() on invalid input

https://bugzilla.redhat.com/show_bug.cgi?id=2433121

redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-0966

redhat Patch Available

https://access.redhat.com/errata/RHSA-2026:7067

Vendor Advisories for CVE-2026-0966(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-wcqf-w94x-4wg2
GitHub Security AdvisoriesMedium
The API function `ssh_get_hexa()` is vulnerable, when 0-lenght input is provided to this function...

Frequently asked(5)

What is CVE-2026-0966?

CVE-2026-0966 is a high vulnerability published on March 26, 2026. A flaw was found in libssh. The API function sshgethexa() 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…

When was CVE-2026-0966 disclosed?

CVE-2026-0966 was first published in the National Vulnerability Database on March 26, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-0966 actively exploited?

CVE-2026-0966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-0966?

CVE-2026-0966 has a CVSS v3 base score of 8.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5.

How do I remediate CVE-2026-0966?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0966, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-0966

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

libssh 0.12.0 and 0.11.4 security releases – libssh

2433121 – (CVE-2026-0966) CVE-2026-0966 libssh: Buffer underflow in ssh_get_hexa() on invalid input

cve-details

📣 Vendor Advisories for CVE-2026-0966(1)

❓ Frequently asked(5)