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    CVE-2026-59851

    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.

    Published:Jul 21, 2026
    Last Modified:Aug 17, 2026
    EPS:Jul 21, 2026
    EPSS Score:0.00274
    CVSS Score:8.8

    Affected Products

    Vendor
    Libssh
    Product
    Libssh
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-59849 (CVSS 3.1) — A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause li…
    CVE-2026-59848 (CVSS 5.3) — A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh cli…
    CVE-2026-59847 (CVSS 5.9) — A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effe…
    CVE-2026-59846 (CVSS 3.9) — A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell…
    CVE-2026-59845 (CVSS 5.3) — A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID…
    CVE-2026-59844 (CVSS 6.5) — A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily …
    CVE-2026-59843 (CVSS 6.5) — A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CH…
    CVE-2026-59842 (CVSS 3.7) — A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key sh…
    CVE-2026-15370 (CVSS 6.7) — A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsaf…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High