CVE-2026-59851
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Libssh
PublishedJul 21, 2026
First seenJul 21, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libssh libssh | No range specified, 0.12.0 | — |
| redhat hardened_images | No range specified | — |
| redhat enterprise_linux | 10.0, 10.2 | — |
| redhat enterprise_linux_eus | 10.2 | — |
| redhat enterprise_linux_for_els | 10.2 | — |
| redhat enterprise_linux_for_ibm_z_systems | 10.0_s390x, 10.2 | — |
| redhat enterprise_linux_for_ibm_z_systems_els | 10.2 | — |
| redhat enterprise_linux_for_ibm_z_systems_eus | 10.2 | — |
| redhat enterprise_linux_for_power_little_endian | 10.0_ppc64le, 10.2 | — |
| redhat enterprise_linux_for_power_little_endian_els | 10.2 | — |
| redhat enterprise_linux_for_power_little_endian_eus | 10.2 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.