CVE-2026-0966
The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- EPSS
- 0.58% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-124
- Affected
- libssh/libssh · redhat/hardened images · redhat/openshift container platform · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:18160
- https://access.redhat.com/errata/RHSA-2026:18683
- https://access.redhat.com/errata/RHSA-2026:7067Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-0966Mitigation, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2433121Issue Tracking, Vendor Advisory
- https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/Release Notes
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.