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ALSA-2026:55855 — Important: libssh security update

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.

bdu:2026-15370

BELL-CVE-2026-59842

Affected: Alpaquita:stream: libssh

fkie_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 amounts of server memory.

GHSA-x94w-cg8g-g593

RHSA-2026:42922 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

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

RHSA-2026:55855 — security update for libssh

security update for libssh

RLSA-2026:55855 — Important: libssh security update

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.

Withdrawn: UBUNTU-CVE-2026-59842

Withdrawn by the publisher.

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

WID-SEC-W-2026-2428 — libssh: Mehrere Schwachstellen

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.