CVE-2026-59851
Published: July 22, 2026Last modified: July 28, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Notes
Introduced in libssh-0.12.0 according to https://www.libssh.org/security/advisories/CVE-2026-59851.txt
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | libssh | Not affected (0.10.4-r0) |
| 25 LTS | libssh | Not affected (0.11.1-r0) | |
| Stream | libssh | Fixed (0.12.1-r0) |