CVE-2026-59851
highA flaw was found in libssh.
Vendor / product: Libssh — libssh
A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.
CVSS
8.8
8.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-07-21 15:16
Modified: 2026-11-04 23:17
NVD status: Undergoing Analysis
Last synced 40 minutes ago
Verified against the source API 2026-11-04 23:38 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
libssh / libssh all versions
redhat / hardened_images all versions
redhat / enterprise_linux 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-59851
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2498184
References
- https://access.redhat.com/errata/RHSA-2026:42922 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:55855 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2026-59851 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2498184 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-04 23:38 UTC · record ↗