CVE-2026-59851
Libssh: libssh: authentication bypass via missing gssapi principal check
- State
- Published
- Severity
- 8.8 High
- Published
- Jul 21, 2026
- Updated
- Aug 17, 2026
- Reserved
- Jul 7, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
Red Hat Enterprise Linux 10Red Hat |
|
Red Hat Hardened ImagesRed Hat |
|
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat |
References
- RHSA-2026:42922vendor-advisory
- RHSA-2026:55855vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-59851vdb-entry
- RHBZ#2498184issue-tracking
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