JLSEC-2026-778

A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH Secure Shell connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, integrity, and availability of SSH communications via an...

JLSEC-2026-782

A flaw was found in libssh. A remote attacker, by controlling client configuration files or knownhosts files, could craft specific hostnames that when processed by the matchpattern function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion,...

JLSEC-2026-783

A flaw was found in libssh in which a malicious SFTP SSH File Transfer Protocol server can exploit this by sending a malformed 'longname' field within an SSHFXPNAME message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can...

SUSE CVE-2026-59842

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...

SUSE 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...

UBUNTU-CVE-2026-59842

A flaw was found in libssh. During server-side GSSAPI key exchange, a...

UBUNTU-CVE-2026-59846

A flaw was found in libssh. A malicious username expanded through %r i...

Slackware Linux 15.0 / current libssh Multiple Vulnerabilities (SSA:2026-202-01)

The version of libssh installed on the remote host is prior to 0.11.5 / 0.12.1. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-202-01 advisory. New libssh packages are available for Slackware 15.0 and -current to fix security issues. Tenable has extracted the...

UBUNTU-CVE-2026-59850

A flaw was found in libssh. If data packets are processed after a chan...

UBUNTU-CVE-2026-15370

A flaw was found in libssh. During SFTP server directory listing, the...

UBUNTU-CVE-2026-59845

A flaw was found in libssh. When ProxyCommand is used, an unchecked fo...

UBUNTU-CVE-2026-59851

A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled,...

UBUNTU-CVE-2026-59847

A flaw was found in libssh. Incorrect AES-GCM finalization checks in b...

UBUNTU-CVE-2026-59848

A flaw was found in libssh. A malicious SFTP server can send responses...

UBUNTU-CVE-2026-59849

A flaw was found in libssh. Logic errors in automatic certificate-base...

UBUNTU-CVE-2026-59843

A flaw was found in libssh. A remote authenticated peer can advertise...

libssh: libssh: authentication bypass via missing GSSAPI principal check

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...

libssh: libssh: information disclosure via short GSSAPI Curve25519 public key

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...

libssh: libssh: denial of service via automatic certificate authentication loop

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...

libssh: libssh: denial of service via SFTP responses with unknown request IDs

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...