What is CVE-2026-59851?

CVE-2026-59851 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-07-21.

How severe is CVE-2026-59851?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Red Hat Enterprise Linux 10

CVE-2026-59851

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…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Hardened Images

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-59851?: CVE-2026-59851 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-07-21.
How severe is CVE-2026-59851?: High severity. CVSS v3 base score is 8.8 out of 10.