CVE-2026-59851 | A flaw was found in libssh. On servers with GSSAPIKeyExchang… | CVSS 8.8 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-59851
State: PUBLISHED
Assigner: redhat
Reserved: 2026-07-07 15:40 UTC
Published: 2026-07-21 14:20 UTC
Last updated: 2026-07-21 14:40 UTC
Primary CWE: CWE-863
Incorrect Authorization
Vendor / Product: Red Hat / Red Hat Enterprise Linux 10
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (4)

Vendor	Product	Platform	Versions
Red Hat	Red Hat Enterprise Linux 10	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—
Red Hat	Red Hat Hardened Images	—	—

Weakness (CWE)

CWE	Source	Description
CWE-863	cna	Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References (2)