Is CVE-2026-0966 in the CISA KEV catalog?

No. CVE-2026-0966 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-0966 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-0966?

CVE-2026-0966 has an EPSS score of 0.58% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-0966?

Upgrade libssh on debian unstable to 0.12.0-1 or later. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2026-0966

MEDIUM

6.5

CVSS v3

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.

CWE-124

How to fix

Remediation Available

libsshDebian

Fixed in:0.12.0-1CVE-2026-0966

libsshRed Hat / RHEL

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libsshRocky

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-configRocky

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-configRed Hat / RHEL

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-debuginfoRocky

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-debuginfoRed Hat / RHEL

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-debugsourceRed Hat / RHEL

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-debugsourceRocky

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-develRocky

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libssh-develRed Hat / RHEL

Fixed in:0:0.12.0-2.el10RHSA-2026:18160

Fixed in:0:0.10.4-18.el9RHSA-2026:18683

libsshUbuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm4USN-8051-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6USN-8051-2

Fixed in:0.9.3-2ubuntu2.5+esm3USN-8051-2

Fixed in:0.9.6-2ubuntu0.22.04.6USN-8051-1

Fixed in:0.10.6-2ubuntu0.3USN-8051-1

Fixed in:0.11.2-1ubuntu0.2USN-8051-1

libssh-4Ubuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm4USN-8051-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6USN-8051-2

Fixed in:0.9.3-2ubuntu2.5+esm3USN-8051-2

Fixed in:0.9.6-2ubuntu0.22.04.6USN-8051-1

Fixed in:0.10.6-2ubuntu0.3USN-8051-1

Fixed in:0.11.2-1ubuntu0.2USN-8051-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.58%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Vendor Advisory3

Release Notes1

libssh.org

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-19.