RHSA-2026:62218 — Security Advisory

An update for libssh is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.