AlmaLinux alert ALSA-2026:62218 (libssh)

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[Announce]  [Security Advisory] ALSA-2026:62218: libssh security update (Moderate)
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Wed, 02 Sep 2026 12:09:35 +0000
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<010001a062064cf7-bc2b258a-1f4e-433c-8701-5e6f83a86f11-000000@email.amazonses.com>
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Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 8
Type: Security
Severity: Moderate
Release date: 2026-09-02

Summary:

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

Security Fix(es):  

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


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.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/8/ALSA-2026-62218.html

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Kind regards,
AlmaLinux Team
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