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{"acknowledgement": "Red Hat would like to thank Aisle Research for reporting this issue.", "bugzilla": {"description": "libssh: libssh: authentication bypass via missing GSSAPI principal check", "id": "2498184", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498184"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-863", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Disable GSSAPIKeyExchange."}, "name": "CVE-2026-59851", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "libssh", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-21T14:14:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-59851\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-59851"], "threat_severity": "Important"}

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