Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-0966

CVE-2026-0966HIGH

Red Hat Red Hat Enterprise Linux 10 — Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  H    8.2   .0058   45.9     —

AFFECTED
  Product                                 Versions     Fixed
  Red Hat Enterprise Linux 10             unspecified  0:0.12.0-2.el10
  Red Hat Enterprise Linux 9              unspecified  0:0.10.4-18.el9
  Red Hat Enterprise Linux 9              unspecified  0:0.10.4-18.el9
  Red Hat Hardened Images                 unspecified  0.12.0-1.1.hum1
  Red Hat Enterprise Linux 6              unspecified  —
  Red Hat Enterprise Linux 7              unspecified  —
  Red Hat Enterprise Linux 8              unspecified  —
  Red Hat Hardened Images                 unspecified  —
  Red Hat OpenShift Container Platform 4  unspecified  —
  Red Hat OpenShift Container Platform 4  unspecified  —

TIMELINE
  Jan 14  Reserved by redhat
  Mar 26  Published (CNA: redhat)
  Aug 21  RESCORED — CVE-2026-0966 (Red Hat Enterprise Linux 10). CVSS 6.5 → 8.2 (NVD).

CWE-124 · CNA: redhat · CVSS v3.1 · 6 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 14, 2026	Reserved	Reserved by redhat
March 26, 2026	Published	Published (CNA: redhat)
August 21, 2026	RESCORED	RESCORED — CVE-2026-0966 (Red Hat Enterprise Linux 10). CVSS 6.5 → 8.2 (NVD).

Affected

Affected products and packages — 10 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	0:0.12.0-2.el10
Red Hat	Red Hat Enterprise Linux 9	—	—	0:0.10.4-18.el9
Red Hat	Red Hat Enterprise Linux 9	—	—	0:0.10.4-18.el9
Red Hat	Red Hat Hardened Images	—	—	0.12.0-1.1.hum1
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Hardened Images	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-124

References (6)

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 [Mitigation, Vendor Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2433121 [Issue Tracking, Vendor Advisory]
https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ [Release Notes]

Authoritative record: CVE-2026-0966 at cve.org

Vendors: red hat

Weaknesses: CWE-124

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-0966 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.