Vulnerability record · CVE-2026-59851 · published 21 July 2026

CVE-2026-59851: Libssh incorrect authorization vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.49% · top 60.4% CWE-863 · Incorrect authorization

8.8CVSS 3.1 base score

0.49%EPSS exploitation probability, 30 days

NoNot in CISA KEV

3Affected product versions listed by NVD

4References

17 Aug 2026Last modified by NVD

Description

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Libssh Libssh

Enterprise Linux Redhat

Hardened Images Redhat

References

Link	Tags
https://access.redhat.com/errata/RHSA-2026:42922	Issue Tracking
https://access.redhat.com/errata/RHSA-2026:55855
https://access.redhat.com/security/cve/CVE-2026-59851	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2498184	Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-59851), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.