Affected: AlmaLinux:10: libssh, AlmaLinux:10: libssh-config, AlmaLinux:10: libssh-devel

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

* libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842) * libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843) * libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844) * libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845) * libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846) * libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847) * libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848) * libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849) * libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850) * libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851) * libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected: Alpaquita:23: libssh, Alpaquita:25: libssh, Alpaquita:stream: libssh

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.

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.

Affected: openEuler:20.03-LTS-SP4: libssh

The ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. The complete control of the client is made by the programmer. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel for your remote programs. With its Secure FTP implementation, you can play with remote files easily, without third-party programs others than libcrypto (from openssl). Security Fix(es):

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.(CVE-2026-59843)

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.(CVE-2026-59844)

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.(CVE-2026-59845)

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.(CVE-2026-59847)

A flaw was found in libssh. If data p…

libssh-config-0.11.5-1.1 on GA media

libssh: libssh: information disclosure via short GSSAPI Curve25519 public key libssh: libssh: denial of service via zero advertised channel packet size libssh: libssh: denial of service via oversized SFTP read length libssh: libssh: denial of service via unchecked ProxyCommand fork() failure libssh: libssh: information disclosure via ProxyCommand %r username expansion libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification libssh: libssh: denial of service via SFTP responses with unknown request IDs libssh: libssh: denial of service via automatic certificate authentication loop libssh: libssh: use-after-free via data callbacks on closed channels libssh: libssh: authentication bypass via missing GSSAPI principal check

Affected: Rocky Linux:10: libssh

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

* libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)

* libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)

* libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)

* libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)

* libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)

* libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)

* libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)

* libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)

* libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)

* libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)

* libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Security update for libssh

Affected: Ubuntu:Pro:16.04:LTS: libssh, Ubuntu:Pro:18.04:LTS: libssh, Ubuntu:Pro:20.04:LTS: libssh, Ubuntu:22.04:LTS: libssh, Ubuntu:24.04:LTS: libssh, Ubuntu:26.04:LTS: libssh

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.

Ein Angreifer kann mehrere Schwachstellen in libssh ausnutzen, um erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Angriff auszulösen und Daten zu manipulieren.