CVE-2026-59851
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:0.12.0-3.el10_2 < * | unaffected |
| Red Hat | Red Hat Hardened Images | 0.12.1-4.hum1 < * | unaffected |
Weaknesses
- CWE-863: Incorrect Authorization
Workarounds
Disable GSSAPIKeyExchange.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
- https://access.redhat.com/errata/RHSA-2026:42922
- https://access.redhat.com/errata/RHSA-2026:55855
- https://access.redhat.com/security/cve/CVE-2026-59851
- https://bugzilla.redhat.com/show_bug.cgi?id=2498184
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