USN-8093-2: libssh vulnerability

USN-8093-1 fixed a vulnerability in libssh. This update provides the corresponsing fix for Ubuntu 26.04 LTS. Original advisory details: It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds...

USN-8093-2 libssh vulnerability

USN-8093-1 fixed a vulnerability in libssh. This update provides the corresponsing fix for Ubuntu 26.04 LTS. Original advisory details: It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds...

PT-2026-80725

Name of the Vulnerable Software and Affected Versions libssh affected versions not specified Description An issue exists where libssh incorrectly performs bounds checking when processing SFTP extensions. If a client application queries extension data out of bounds, it can lead to an application...

CLSA-2026-1787056678 libssh: Fix of 2 CVEs

CVE-2025-4878: initialize pointers and properly check the return value of sshpkiimportprivkeyfile in privatekeyfromfile, so a missing key file no longer leaves an uninitialized key in use - CVE-2026-59846: validate usernames and reject shell metacharacters before they are expanded into a...

libssh security update

An update is available for libssh. This update affects Rocky Linux 10. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list libssh is a library which implements the SSH protocol. It can be used to...

RLSA-2026:55855 Important: libssh security update

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fixes: libssh: libssh: information disclosure via short GSSAPI Curve25519 public key CVE-2026-59842 libssh: libssh: denial of service via zero advertised channel packet size...

RHSA-2026:55855 Red Hat Security Advisory: libssh security update

Bulletin has no description...

Oracle Linux 10 : libssh (ELSA-2026-55855)

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-55855 advisory. 0.12.0-3 - Backport CVE fixes from 0.12.2 Resolves: RHEL-213004 Resolves: RHEL-213029 Resolves: RHEL-213032 Resolves: RHEL-213039 Resolves: RHEL-2130...

Red Hat Security Advisory 2026-55855-03

Red Hat Security Advisory 2026-55855-03 - An update for libssh is now available for Red Hat Enterprise Linux 10. Issues addressed include buffer overflow, bypass, denial of service, information leakage, and use-after-free vulnerabilities...

RockyLinux 10 : libssh (RLSA-2026:55855)

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:55855 advisory. libssh: libssh: information disclosure via short GSSAPI Curve25519 public key CVE-2026-59842 libssh: libssh: denial of service via zero advertised...

RHEL 10 : libssh (RHSA-2026:55855)

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:55855 advisory. libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fixes: libssh:...

AlmaLinux 10 : libssh (ALSA-2026:55855)

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:55855 advisory. libssh: libssh: information disclosure via short GSSAPI Curve25519 public key CVE-2026-59842 libssh: libssh: denial of service via zero advertised chann...

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 unchecked ProxyCommand fork() failure

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...

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...

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...

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: 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...

libssh: libssh: information disclosure via ProxyCommand %r username expansion

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...

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...