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CVE-2026-59849

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.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux For Els and 9 more
CVE-2026-59842

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 amounts of server memory.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux For Els and 9 more
CVE-2026-0967

Libssh: libssh: denial of service via inefficient regular expression processing

A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hummingbird and 2 more
CVE-2026-0968

Libssh: libssh: denial of service due to malformed sftp message

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 `SSH_FXP_NAME` message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected behavior or lead to a denial of service (DoS) due to application crashes.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hummingbird and 2 more
CVE-2026-0965

Libssh: libssh: denial of service via improper configuration file handling

A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A local attacker can exploit this by providing a malicious configuration file or when the system is misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and access dangerous files, such as block devices or large system files, which can disrupt normal operations.

CVSS 3.0 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hummingbird and 2 more
CVE-2025-14821

Libssh: libssh: insecure default configuration leads to local man-in-the-middle attacks on windows

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 insecure default configuration on Windows systems where the library automatically loads configuration files from the C:\etc directory, which can be created and modified by unprivileged local users.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 3 more
CVE-2023-6918

Libssh: missing checks for return values for digests

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

CVSS 3.1 · 3.7 Low EPSS 1.4% KEV · Not listed
Vendors
Fedoraproject Libssh Redhat
Products
Fedora Libssh Enterprise Linux and 1 more
CVE-2023-6004

Libssh: proxycommand/proxyjump features allow injection of malicious code through hostname

A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Libssh Redhat
Products
Fedora Libssh Enterprise Linux and 1 more
CVE-2025-5987

Libssh: invalid return code for chacha20 poly1305 with openssl backend

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

CVSS 3.1 · 8.1 High EPSS 1.7% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-15370

Libssh: libssh: stack buffer overflow in sftp server longname construction

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.

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux For Els and 9 more
CVE-2025-5318

Libssh: out-of-bounds read in sftp_handle()

A flaw was found in the libssh library in versions less than 0.11.2. An out-of-bounds read can be triggered in the sftp_handle function due to an incorrect comparison check that permits the function to access memory beyond the valid handle list and to return an invalid pointer, which is used in further processing. This vulnerability allows an authenticated remote attacker to potentially read unintended memory regions, exposing sensitive information or affect service behavior.

CVSS 3.1 · 5.4 Medium EPSS 1.9% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Ai Inference Server Enterprise Linux and 8 more
CVE-2026-0966

Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 4 more
CVE-2026-0964

Libssh: improper sanitation of paths received from scp servers

A malicious SCP server can send unexpected paths that could make the client application override local files outside of working directory. This could be misused to create malicious executable or configuration files and make the user execute them under specific consequences. This is the same issue as in OpenSSH, tracked as CVE-2019-6111.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 4 more
CVE-2025-8114

Libssh: null pointer dereference in libssh kex session id calculation

A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL pointer dereference. This issue can cause the client or server to crash.

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Openshift and 1 more
CVE-2026-59851

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.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux Eus and 9 more
CVE-2025-5449

Libssh: integer overflow in libssh sftp server packet length validation leading to denial of service

A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.

CVSS 3.1 · 6.5 Medium EPSS 1.0% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Openshift and 1 more
CVE-2025-5372

Libssh: incorrect return code handling in ssh_kdf() in libssh

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

CVSS 3.1 · 5 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Openshift and 6 more
CVE-2025-5351

Libssh: double free vulnerability in libssh key export functions

A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Openshift and 2 more
CVE-2026-59847

Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification

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.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 1 more
CVE-2026-59850

Libssh: libssh: use-after-free via data callbacks on closed channels

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 1 more