Veille CVE

Mardi 21 juillet 2026

11 CVE

Critique 0 Élevée 5 Moyenne 5 Faible 1 Non évaluée 0 Exploitées (KEV) Tri : plus récentes « Libssh libssh » ✕
  1. CVE-2026-59851 8.8 Élevée

    Red Hat Enterprise Linux 10 · Red Hat Hardened Images · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9

    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.

  2. CVE-2026-59850 7.5 Élevée

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions.

  3. CVE-2026-59849 7.5 Élevée

    Red Hat Enterprise Linux 10 · Red Hat Hardened Images · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9

    A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.

  4. CVE-2026-59848 5.3 Moyenne

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.

  5. CVE-2026-59847 7.5 Élevée

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.

  6. CVE-2026-59846 3.9 Faible

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior.

  7. CVE-2026-59845 5.9 Moyenne

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

  8. CVE-2026-59844 6.5 Moyenne

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.

  9. CVE-2026-59843 6.5 Moyenne

    Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Hardened Images

    A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.

  10. CVE-2026-59842 5.3 Moyenne

    Red Hat Enterprise Linux 10 · Red Hat Hardened Images · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9

    A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

  11. CVE-2026-15370 7.3 Élevée

    Red Hat Enterprise Linux 10 · Red Hat Hardened Images · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9

    A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.