CVE-2026-59851
Libssh: libssh: authentication bypass via missing gssapi principal check
- Published
- Jul 21, 2026
- Updated
- Aug 17, 2026
- Assigning CNA
- redhat
- Evidence observed
- Aug 12, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 21.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
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.
Sources
1- 1day-archiveResearch
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